{"id":11264,"date":"2020-07-02T04:43:00","date_gmt":"2020-07-02T11:43:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=11264"},"modified":"2026-07-16T23:29:33","modified_gmt":"2026-07-17T06:29:33","slug":"p0136-code-o2-sensor-circuit-bank-1-sensor-2","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/","title":{"rendered":"P0136 Code: O2 Sensor Circuit (Bank 1, Sensor 2)"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 8<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column11264_2eb379-55 > .kt-inside-inner-col,.kadence-column11264_2eb379-55 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column11264_2eb379-55 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column11264_2eb379-55 > .kt-inside-inner-col{flex-direction:column;}.kadence-column11264_2eb379-55 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column11264_2eb379-55 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column11264_2eb379-55{position:relative;}@media all and (max-width: 1024px){.kadence-column11264_2eb379-55 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column11264_2eb379-55 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column11264_2eb379-55 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"summary-widget\">\n    <h3>Summary<\/h3>\n    <ul class=\"summary-grid\">\n            <li class=\"summary-grid-list\">\n            <div class=\"sm-item\">\n\n                                    <p class=\"sm-title\">\n                        A P0136 Code means the bank 1, sensor 2 oxygen sensor circuit is reading a voltage the ECM considers abnormal.                    <\/p>\n                \n            <\/div>\n        <\/li>\n            <li class=\"summary-grid-list\">\n            <div class=\"sm-item\">\n\n                                    <p class=\"sm-title\">\n                        What it affects: catalytic converter monitoring and, in some cases, fuel trim adjustments.                    <\/p>\n                \n            <\/div>\n        <\/li>\n            <li class=\"summary-grid-list\">\n            <div class=\"sm-item\">\n\n                                    <p class=\"sm-title\">\n                        How serious it is: usually moderate, but it can lead to bigger repair bills if ignored.                    <\/p>\n                \n            <\/div>\n        <\/li>\n            <li class=\"summary-grid-list\">\n            <div class=\"sm-item\">\n\n                                    <p class=\"sm-title\">\n                        Most common causes: a failing oxygen sensor, wiring or connector damage, exhaust leaks, or a degrading catalytic converter.                    <\/p>\n                \n            <\/div>\n        <\/li>\n            <li class=\"summary-grid-list\">\n            <div class=\"sm-item\">\n\n                                    <p class=\"sm-title\">\n                        What to do first: scan for related codes and check the sensor's wiring and connector before replacing any parts.                    <\/p>\n                \n            <\/div>\n        <\/li>\n            <li class=\"summary-grid-list\">\n            <div class=\"sm-item\">\n\n                                    <p class=\"sm-title\">\n                        Can you keep driving? Yes, in most cases, but you shouldn't put it off for long.                    <\/p>\n                \n            <\/div>\n        <\/li>\n        <\/ul>\n<\/div>\n\n\n<\/div><\/div>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">Code P0136 means your engine control module has flagged a voltage problem with the <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensor\">oxygen sensor<\/a> sitting behind the <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a> on bank 1. This sensor watches how well your catalytic converter is doing its job. Most drivers notice nothing more than a lit check engine light, though the underlying cause can range from a worn sensor to a failing catalyst.<br><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"680\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/oxygen-sensor-image-1024x680.jpeg\" alt=\"an oxygen sensor\" class=\"wp-image-11290\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/oxygen-sensor-image-1024x680.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/oxygen-sensor-image-300x199.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/oxygen-sensor-image-768x510.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/oxygen-sensor-image.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Code P0136 means that the Bank 1 oxygen sensor is not operating correctly.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">P0136 on Some Toyota Vehicles<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Code P0136 may appear on some Toyota vehicles. On a <a href=\"https:\/\/www.carparts.com\/vehicle\/2004\/Toyota\/Camry\/XLE\/4_Cyl_2-dot-4L\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"2004 Toyota Camry XLE 2.4L\">2004 Toyota Camry XLE 2.4L<\/a>, for example, the code appears because of the following conditions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Failed AFS (it may be contaminated with fuel, silicone, or water)<\/li>\n\n\n\n<li>Air induction system air leaks (e.g., intake manifold)<\/li>\n\n\n\n<li>Failed HO2S (it may be contaminated with fuel, silicone, or water)<\/li>\n\n\n\n<li>HO2S heater power (12v) circuit is open (check power circuit from EFI relay)<\/li>\n\n\n\n<li>HO2S signal circuit is open, shorted to ground, or shorted to voltage<\/li>\n\n\n\n<li>Damaged HO2S connector (check pins for damage and for moisture)<\/li>\n\n\n\n<li>Exhaust manifold and exhaust pipes air leaks<\/li>\n\n\n\n<li>Failed ECM<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0136 Code Mean?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Diagnostic trouble code (DTC) P0136 stands for &ldquo;O2 Sensor Circuit (Bank 1, Sensor 2).&rdquo; It refers to the same malfunction as the engine code P0137, except it applies to the second O2 sensor on Bank 1. The P0136 code triggers when the ECM believes that the Bank 1 O2 sensor is <a href=\"https:\/\/www.carparts.com\/blog\/p0140-code-oxygen-sensor-circuit-no-activity-detected-bank-1-sensor-2\/#Note_on_Malfunctioning_O2_Sensors\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"not operating correctly\">not operating correctly<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bank 1 refers to the side of the engine that holds the number one cylinder. Sensor 2 sits downstream, positioned after the catalytic converter closest to the engine. That converter runs very hot and handles nitrogen oxides, which is why it&rsquo;s mounted so close to the exhaust manifold. Sensor 2&rsquo;s job isn&rsquo;t to fine-tune fuel delivery. Instead, it measures how efficiently the catalytic converter is cleaning up exhaust gases.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">A traditional oxygen sensor produces a voltage between roughly 0.1 and 0.9 volts. The ECM sets P0136 when it sees sensor 2&rsquo;s voltage sitting outside the expected range for too long, often around two minutes of low or erratic readings. If the voltage instead reads too high, you&rsquo;d be looking at the related <a href=\"https:\/\/www.carparts.com\/blog\/p0138-code-o2-sensor-circuit-high-voltage-bank-1-sensor-2\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P0138 code\">P0138 code<\/a> instead, which points to the same sensor but a different type of electrical fault.<\/p>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"680\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-holding-oxygen-sensor-1024x680.jpeg\" alt=\"mechanic holding an oxygen sensor\" class=\"wp-image-11289\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-holding-oxygen-sensor-1024x680.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-holding-oxygen-sensor-300x199.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-holding-oxygen-sensor-768x510.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-holding-oxygen-sensor.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Malfunctioning oxygen sensor circuit issues can trigger the P0136 code.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">What Is the Downstream Oxygen Sensor?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The downstream oxygen sensor, also called sensor 2, threads into the exhaust pipe just behind the catalytic converter on bank 1. Unlike the upstream sensor, it doesn&rsquo;t directly adjust your fuel mixture. It exists to confirm the catalytic converter is converting harmful gases the way it&rsquo;s supposed to.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Most downstream sensors include a built-in heater. That heater brings the sensor up to operating temperature quickly so the ECM can enter closed loop operation sooner, which is when the computer actively manages the air-to-fuel ratio based on sensor feedback. Before the closed loop kicks in, the engine runs on preset fuel maps instead, which burn less efficiently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because this sensor sits downstream, its voltage signal moves more slowly and with less fluctuation than the upstream sensor&rsquo;s signal. That steady pattern is exactly what the ECM expects to see when the catalytic converter is healthy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of the P0136 Code?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There are several probable reasons why a scanner registers the P0136 code. They include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/blog\/bad-o2-sensor-symptoms-causes-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Malfunctioning oxygen sensor\">Malfunctioning oxygen sensor<\/a><\/li>\n\n\n\n<li>Malfunctioning oxygen sensor circuit issues (open, short, or high resistance)<\/li>\n\n\n\n<li>Leak in the exhaust system<\/li>\n\n\n\n<li>Corroded oxygen sensor connector<\/li>\n\n\n\n<li>Faulty PCM (defective or requires software upgrade)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">On some <a href=\"https:\/\/www.carparts.com\/toyota\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Toyota\">Toyota<\/a> models, including certain 2004 Camry XLE trims, P0136 can also point to a contaminated airflow sensor or an air leak in the intake system, alongside the usual sensor and wiring causes. If you drive one of these vehicles, it&rsquo;s worth having the intake checked as part of your diagnosis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0136 Code?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In most cases, the <a href=\"https:\/\/www.carparts.com\/blog\/why-is-my-check-engine-light-on\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light\">check engine light<\/a> is the only sign you&rsquo;ll notice. The engine typically keeps running normally day to day. That said, some drivers do experience secondary symptoms tied to the underlying cause.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You might notice poor fuel economy if the catalytic converter issue is throwing off the ECM&rsquo;s calculations. A rough idle or mild misfire can show up if the engine spends extended time in open loop mode. Higher tailpipe emissions are also possible, which can become a problem if your area requires an emissions test.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Serious Is the P0136 Code?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">P0136 sits in the moderate range. Your car will likely keep driving normally in the short term, so this isn&rsquo;t an emergency. But letting it go unaddressed carries real downsides. Extended time in open loop operation strains your fuel economy and can eventually affect <a href=\"https:\/\/www.carparts.com\/engine-and-drivetrain\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine internals\">engine internals<\/a>. A failing catalytic converter tied to this code can also get more expensive to repair the longer it&rsquo;s ignored.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It&rsquo;s worth getting this diagnosed within a reasonable window rather than driving on it indefinitely.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Do You Diagnose the P0136 Code?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Diagnosing P0136 takes a bit of patience since several systems can be involved. If you&rsquo;re not confident working with exhaust components and electrical circuits, this is a reasonable job to hand off to a trusted mechanic.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Need to refresh your knowledge of the P0136 code? Watch this helpful video:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Toyota 4Runner 3.4 - P0136 O2 Sensor Malfunction Bank 1 Sensor 2\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Y8VcoNjgQ34?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Here&rsquo;s an overview of what the process might involve:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Pull the code and check for <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"related codes\">related codes<\/a><\/strong>. Scan tools that support freeze frame data can show you the exact voltage reading that triggered the fault, and note whether any other O2 sensor codes are present alongside it.<\/li>\n\n\n\n<li><strong>Inspect the sensor&rsquo;s wiring and connector. <\/strong>Look for corrosion, loose pins, or damaged insulation anywhere along the harness.<\/li>\n\n\n\n<li><strong>Check for exhaust leaks.<\/strong> A leak near sensor 2 can pull in outside air and throw off the reading entirely.<\/li>\n\n\n\n<li><strong>Evaluate the catalytic converter. <\/strong>If the wiring and exhaust check out clean, the converter itself may be losing efficiency.<\/li>\n\n\n\n<li><strong>Test the sensor directly.<\/strong> A multimeter or scan tool with live data can confirm whether the sensor itself is producing a normal voltage signal.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">How Do You Fix the P0136 Code?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To resolve the P0136 code, you must identify the faulty part and determine what went wrong with it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Oxygen Sensor Replacement<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the oxygen sensor itself has failed, you&rsquo;ll need to replace it. Start by removing the wiring clips that hold the sensor&rsquo;s cable in place, then disconnect the electrical connector. An oxygen sensor socket makes removing the sensor itself straightforward. Installing the new sensor is simply the reverse process, and it&rsquo;s worth testing it afterward to confirm proper operation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Oxygen Sensor Circuit Issues<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Over time, the oxygen sensor circuit wears out from use. It can develop issues like open circuits and shorts that prevent current from flowing through it. Or its resistance can get high enough to reduce the current flow.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unfortunately, there&rsquo;s no way to repair any damage done to the oxygen sensor circuit. Instead, you must replace the O2 sensor.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Oxygen Sensor Connector Corrosion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the wiring or connector is the problem, there&rsquo;s no way to repair worn internal circuitry. Damaged wiring segments or connectors typically need to be replaced outright rather than patched.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Exhaust System Leak<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If an exhaust leak is pulling in outside air near the sensor, minor leaks can sometimes be patched temporarily, but a proper fix usually means replacing the affected section of pipe or gasket.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Catalyst Failure<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the catalytic converter itself has failed, that&rsquo;s a bigger job. It starts with <a href=\"https:\/\/www.carparts.com\/blog\/where-is-the-catalytic-converter-located\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"locating the catalytic converter\">locating the catalytic converter<\/a> underneath the vehicle, then disconnecting the oxygen sensors and cutting out a welded converter if it isn&rsquo;t bolted in place. The new converter needs pipes that match your exhaust system, along with fresh hangers and gaskets.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bad Powertrain Control Module<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the PCM is the culprit, an outdated software version can sometimes be corrected with a manufacturer update. A genuinely defective PCM will need replacement, though this is one of the less common causes of P0136.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The specific steps required to resolve the P0136 code can vary between vehicles. Not every case is the same. <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Consult your owner&rsquo;s manual\">Consult your owner&rsquo;s manual<\/a> or trusted <a href=\"https:\/\/www.carparts.com\/blog\/best-online-resources-to-help-you-learn-how-to-fix-cars\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"online resources\">online resources<\/a> if you aren&rsquo;t sure about something. If you feel that you can&rsquo;t perform the DIY repairs required to fix the problem, ask a trusted mechanic for help.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQs<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1783675783837\"><strong class=\"schema-faq-question\">Is P0136 the same as P0137?<\/strong> <p class=\"schema-faq-answer\">P0136 and P0137 both point to bank 1 sensor 2, but they&rsquo;re not identical. P0137 specifically flags low voltage, while P0136 is the broader circuit malfunction code that can include several types of electrical faults.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783675801506\"><strong class=\"schema-faq-question\">Can I keep driving with a P0136 code?<\/strong> <p class=\"schema-faq-answer\">Yes, you can generally keep driving with a P0136 code active. The engine typically keeps running fine in the short term. Long-term neglect, though, can affect fuel economy and put stress on the catalytic converter.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783675821050\"><strong class=\"schema-faq-question\">Will the P0136 code clear itself?<\/strong> <p class=\"schema-faq-answer\">No, the P0136 code won&rsquo;t clear on its own. You&rsquo;ll need to fix the underlying issue and then clear the code with a scan tool, since it usually won&rsquo;t reset automatically even after the problem is resolved.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783675847346\"><strong class=\"schema-faq-question\">How much does it cost to fix P0136?<\/strong> <p class=\"schema-faq-answer\">Costs vary widely depending on the cause. A replacement oxygen sensor often runs somewhere in the range of fifty to a couple hundred dollars, plus labor. Wiring repairs tend to cost less, while a full catalytic converter replacement runs considerably higher.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783675871013\"><strong class=\"schema-faq-question\">Can a loose gas cap cause P0136?<\/strong> <p class=\"schema-faq-answer\">No, a loose gas cap doesn&rsquo;t cause P0136. Gas cap issues typically trigger evaporative emission codes instead, which are a separate diagnostic category from oxygen sensor circuit codes.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783675896125\"><strong class=\"schema-faq-question\">What&rsquo;s the difference between the upstream and downstream oxygen sensors?<\/strong> <p class=\"schema-faq-answer\">The upstream sensor sits before the catalytic converter and helps the ECM fine-tune the fuel mixture in real time. The downstream sensor, which triggers P0136, sits after the converter and monitors how efficiently it cleans up exhaust gases.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783675925622\"><strong class=\"schema-faq-question\">Does P0136 always mean I need a new oxygen sensor?<\/strong> <p class=\"schema-faq-answer\">Not necessarily. While a failed sensor is one of the most common causes, wiring damage, exhaust leaks, and catalytic converter problems can all trigger the same code without the sensor itself being at fault.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783675948679\"><strong class=\"schema-faq-question\">Can I diagnose P0136 myself?<\/strong> <p class=\"schema-faq-answer\">You can, if you&rsquo;re comfortable working with a scan tool, multimeter, and basic exhaust components. The process involves checking several systems, so less experienced DIYers may prefer having a mechanic handle it.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783675968059\"><strong class=\"schema-faq-question\">Why does P0136 sometimes come with a rough idle?<\/strong> <p class=\"schema-faq-answer\">A rough idle typically shows up when the engine spends extended time in open loop mode because of the underlying sensor or catalyst issue. It&rsquo;s not present in every case, but it&rsquo;s a common secondary symptom.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783676000470\"><strong class=\"schema-faq-question\">Is P0136 linked to my catalytic converter specifically?<\/strong> <p class=\"schema-faq-answer\">Often, yes. Since sensor 2 exists to monitor catalytic converter efficiency, a degrading converter is one of the more common root causes behind this code, alongside sensor and wiring problems.<\/p> <\/div> <\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Shopping for Parts to Resolve Code P0136<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If your scan tool confirms P0136 and you&rsquo;re not confident inspecting exhaust components or testing sensor circuits with a multimeter, it&rsquo;s worth bringing your vehicle to a trusted mechanic. Catalytic converter work in particular involves cutting and welding on some vehicles, which goes beyond typical driveway repairs. A shop can also confirm whether a PCM update is needed, since that usually requires manufacturer-specific software.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ready to tackle the fix yourself? CarParts.com carries a wide selection of <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensor\">oxygen sensor<\/a> options built to fit your exact vehicle, along with catalytic converters and exhaust parts if your diagnosis points that way. Use the vehicle selector to filter down to parts guaranteed to fit, and get your order delivered straight to your doorstep.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n    <!-- start of editable content -->\n\n    <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" aria-label=\"oxygen sensor\" rel=\"noopener\">\n        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/reph960923_1\" alt=\"oxygen sensor\">\n\t<strong>Oxygen Sensor<\/strong>\n    <\/a>\n\n    <a href=\"https:\/\/www.carparts.com\/catalytic%20converter\" target=\"_blank\" aria-label=\"catalytic converter\" rel=\"noopener\">\n        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repf960330_1\" alt=\"catalytic converter\">\n\t<strong>Catalytic Converter<\/strong>\n    <\/a>\n\n    <!-- end of editable content -->\n\n<\/div>\n\n\n\n<div class=\"shop-project\">\n\n    <h2>Shop this Project<\/h2>\n\n    <ul class=\"shop-project-list\">\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repb960901\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repb960901_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated, With Female Connector\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repb960901_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated, With Female Connector\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repb960901\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated, With Female Connector\">DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated, With Female Connector<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$22.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repb960901\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960915_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960915_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\">DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$49.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/set-repn960335ss-2\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-repn960335ss-2_1\" alt=\"Evan Fischer&reg; &ndash; Front and Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME)\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-repn960335ss-2_1\" alt=\"Evan Fischer&reg; &ndash; Front and Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME)\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/set-repn960335ss-2\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Evan Fischer&reg; &ndash; Front and Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME)\">Evan Fischer&reg; &ndash; Front and Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME)<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$299.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/set-repn960335ss-2\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n            <\/ul>\n<\/div>\n\n\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 8<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Code P0136 means your engine control module has flagged a voltage problem with the oxygen sensor sitting behind the catalytic&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":11291,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[1314],"tags":[1190],"ppma_author":[2607],"class_list":["post-11264","post","type-post","status-publish","format-standard","has-post-thumbnail","category-obd-ii-trouble-codes","tag-oxygen-sensor-2","entry"],"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0136 Code: O2 Sensor Circuit (Bank 1, Sensor 2) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what a code P0136 means, its common causes, and the symptoms associated with this diagnostic trouble code. Read on.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0136 Code: O2 Sensor Circuit (Bank 1, Sensor 2) - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what a code P0136 means, its common causes, and the symptoms associated with this diagnostic trouble code. Read on.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2020-07-02T11:43:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-17T06:29:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/oxygen-sensor-in-a-car-engine.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/CarPartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"CarParts.com Research Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1651\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.\",\"sameAs\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/thecpteam\\\/\",\"https:\\\/\\\/www.facebook.com\\\/carpartscom\",\"https:\\\/\\\/www.instagram.com\\\/carpartscom\\\/\",\"https:\\\/\\\/x.com\\\/https:\\\/\\\/twitter.com\\\/CarPartscom\",\"https:\\\/\\\/www.youtube.com\\\/@CarPartscomOfficial\\\/\"],\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/thecpteam\\\/\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675783837\",\"position\":1,\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675783837\",\"name\":\"Is P0136 the same as P0137?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"P0136 and P0137 both point to bank 1 sensor 2, but they're not identical. P0137 specifically flags low voltage, while P0136 is the broader circuit malfunction code that can include several types of electrical faults.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675801506\",\"position\":2,\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675801506\",\"name\":\"Can I keep driving with a P0136 code?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, you can generally keep driving with a P0136 code active. The engine typically keeps running fine in the short term. Long-term neglect, though, can affect fuel economy and put stress on the catalytic converter.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675821050\",\"position\":3,\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675821050\",\"name\":\"Will the P0136 code clear itself?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, the P0136 code won't clear on its own. You'll need to fix the underlying issue and then clear the code with a scan tool, since it usually won't reset automatically even after the problem is resolved.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675847346\",\"position\":4,\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675847346\",\"name\":\"How much does it cost to fix P0136?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Costs vary widely depending on the cause. A replacement oxygen sensor often runs somewhere in the range of fifty to a couple hundred dollars, plus labor. 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The downstream sensor, which triggers P0136, sits after the converter and monitors how efficiently it cleans up exhaust gases.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675925622\",\"position\":7,\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\\\/#faq-question-1783675925622\",\"name\":\"Does P0136 always mean I need a new oxygen sensor?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not necessarily. 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P0137 specifically flags low voltage, while P0136 is the broader circuit malfunction code that can include several types of electrical faults.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675801506","position":2,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675801506","name":"Can I keep driving with a P0136 code?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes, you can generally keep driving with a P0136 code active. The engine typically keeps running fine in the short term. Long-term neglect, though, can affect fuel economy and put stress on the catalytic converter.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675821050","position":3,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675821050","name":"Will the P0136 code clear itself?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"No, the P0136 code won't clear on its own. You'll need to fix the underlying issue and then clear the code with a scan tool, since it usually won't reset automatically even after the problem is resolved.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675847346","position":4,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675847346","name":"How much does it cost to fix P0136?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Costs vary widely depending on the cause. A replacement oxygen sensor often runs somewhere in the range of fifty to a couple hundred dollars, plus labor. Wiring repairs tend to cost less, while a full catalytic converter replacement runs considerably higher.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675871013","position":5,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675871013","name":"Can a loose gas cap cause P0136?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"No, a loose gas cap doesn't cause P0136. Gas cap issues typically trigger evaporative emission codes instead, which are a separate diagnostic category from oxygen sensor circuit codes.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675896125","position":6,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675896125","name":"What's the difference between the upstream and downstream oxygen sensors?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The upstream sensor sits before the catalytic converter and helps the ECM fine-tune the fuel mixture in real time. The downstream sensor, which triggers P0136, sits after the converter and monitors how efficiently it cleans up exhaust gases.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675925622","position":7,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675925622","name":"Does P0136 always mean I need a new oxygen sensor?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Not necessarily. While a failed sensor is one of the most common causes, wiring damage, exhaust leaks, and catalytic converter problems can all trigger the same code without the sensor itself being at fault.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675948679","position":8,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675948679","name":"Can I diagnose P0136 myself?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"You can, if you're comfortable working with a scan tool, multimeter, and basic exhaust components. The process involves checking several systems, so less experienced DIYers may prefer having a mechanic handle it.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675968059","position":9,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783675968059","name":"Why does P0136 sometimes come with a rough idle?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A rough idle typically shows up when the engine spends extended time in open loop mode because of the underlying sensor or catalyst issue. It's not present in every case, but it's a common secondary symptom.<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783676000470","position":10,"url":"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/#faq-question-1783676000470","name":"Is P0136 linked to my catalytic converter specifically?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Often, yes. Since sensor 2 exists to monitor catalytic converter efficiency, a degrading converter is one of the more common root causes behind this code, alongside sensor and wiring problems.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"featured_image_src":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/oxygen-sensor-in-a-car-engine.jpeg","featured_image_src_square":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/oxygen-sensor-in-a-car-engine.jpeg","author_info":{"display_name":"CarParts.com Research Team","author_link":"https:\/\/www.carparts.com\/blog\/author\/thecpteam\/"},"authors":[{"term_id":2607,"user_id":1651,"is_guest":0,"slug":"thecpteam","display_name":"CarParts.com Research Team","avatar_url":{"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg","url2x":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg"},"author_category":"","user_url":"https:\/\/www.carparts.com\/blog\/author\/thecpteam\/","last_name":"","first_name":"CarParts.com Research Team","job_title":"","description":"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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