{"id":12633,"date":"2021-09-08T02:19:00","date_gmt":"2021-09-08T09:19:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=12633"},"modified":"2026-02-10T21:21:26","modified_gmt":"2026-02-11T05:21:26","slug":"p0131-o2-sensor-circuit-low-voltage-bank-1-sensor-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0131-o2-sensor-circuit-low-voltage-bank-1-sensor-1\/","title":{"rendered":"P0131: O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)"},"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\"> 7<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column12633_7cfb67-1e > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column12633_7cfb67-1e > .kt-inside-inner-col,.kadence-column12633_7cfb67-1e > .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-column12633_7cfb67-1e > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column12633_7cfb67-1e > .kt-inside-inner-col{flex-direction:column;}.kadence-column12633_7cfb67-1e > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column12633_7cfb67-1e > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column12633_7cfb67-1e{position:relative;}@media all and (max-width: 1024px){.kadence-column12633_7cfb67-1e > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column12633_7cfb67-1e > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column12633_7cfb67-1e inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-6a2ccf  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-c22f05\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading12633_b5e3bb-eb, .wp-block-kadence-advancedheading.kt-adv-heading12633_b5e3bb-eb[data-kb-block=\"kb-adv-heading12633_b5e3bb-eb\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading12633_b5e3bb-eb mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading12633_b5e3bb-eb[data-kb-block=\"kb-adv-heading12633_b5e3bb-eb\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading12633_b5e3bb-eb img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading12633_b5e3bb-eb[data-kb-block=\"kb-adv-heading12633_b5e3bb-eb\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading12633_b5e3bb-eb summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading12633_b5e3bb-eb\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Diagnostic trouble code (DTC) P0131 stands for &ldquo;O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1).&rdquo;<\/li>\n\n\n\n<li>The code is logged once the PCM detects that the voltage of the affected sensor is below a specified threshold.<\/li>\n\n\n\n<li>The code can also be logged once the PCM senses that the air-fuel ratio stayed in a lean-biased mode for too long.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Oxygen sensors measure the amount of oxygen in the exhaust stream. Your car&rsquo;s primary computer, which is often referred to as the powertrain control module (PCM), uses the signal from the upstream oxygen sensor (sensor 1) when calculating fuel control.<\/p>\n\n\n\n<p>When the #1 sensor on engine Bank 1 produces insufficient voltage, the PCM may record the diagnostic trouble code P0131.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0131 Code Mean?<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Diagnostic trouble code\">Diagnostic trouble code<\/a> (DTC) P0131 stands for &ldquo;O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1).&rdquo; It indicates that the voltage of the affected oxygen sensor stayed below a certain threshold or the air-fuel ratio sensor stayed in a lean-biased mode for too long.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> Although code P0131 is a generic code specified by the Society of Automotive Engineers (SAE), the code&rsquo;s definition may vary depending on the vehicle manufacturer.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"789\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/Electric-transmission-control-module-designed-for-automatic-transmission-inside-look-1024x789.jpg\" alt=\"Electric transmission control module designed for automatic transmission inside look\" class=\"wp-image-43729\" style=\"width:1024px;height:789px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/Electric-transmission-control-module-designed-for-automatic-transmission-inside-look-1024x789.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/Electric-transmission-control-module-designed-for-automatic-transmission-inside-look-300x231.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/Electric-transmission-control-module-designed-for-automatic-transmission-inside-look-768x592.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/Electric-transmission-control-module-designed-for-automatic-transmission-inside-look-1536x1184.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/Electric-transmission-control-module-designed-for-automatic-transmission-inside-look-150x116.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/Electric-transmission-control-module-designed-for-automatic-transmission-inside-look.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">To strike a balance between generating enough power for the vehicle and producing air pollution, the PCM checks the oxygen content in the exhaust gases heading towards the catalytic converter.<\/figcaption><\/figure>\n\n\n\n<p>The engine must strike a balance between generating enough power for the vehicle and producing air pollution. To achieve this, the PCM checks the oxygen content in the exhaust gases heading towards the catalytic converter.<\/p>\n\n\n\n<p>A low voltage signal from the oxygen sensor indicates low oxygen content in the exhaust&mdash;a sign that the engine runs rich. The PCM responds by reducing the fuel going to the engine.<\/p>\n\n\n\n<p>Conversely, a high voltage signal shows high oxygen content and warns that the engine runs lean, leading to the PCM increasing fuel to compensate for the excess air.<\/p>\n\n\n\n<p>To learn more about how your vehicle&rsquo;s computer detects issues with oxygen sensors, you can read our technical explanation <a href=\"https:\/\/www.carparts.com\/blog\/p2270-code-o2-sensor-signal-biasedstuck-lean-bank-1-sensor-2\/#More_About_O2_Sensors_and_Rationality_Checks\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"here\">here<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p0137-code-oxygen-sensor-circuit-low-voltage-bank-1-sensor-2\/\" target=\"_self\" rel=\"dofollow\" class=\"u8d3235287d69e546ab3c40920f03cf2e\"><style> .u8d3235287d69e546ab3c40920f03cf2e { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .u8d3235287d69e546ab3c40920f03cf2e:active, .u8d3235287d69e546ab3c40920f03cf2e:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u8d3235287d69e546ab3c40920f03cf2e { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u8d3235287d69e546ab3c40920f03cf2e .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u8d3235287d69e546ab3c40920f03cf2e .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u8d3235287d69e546ab3c40920f03cf2e:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P0137 Code: Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 2)<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What&rsquo;s the Difference Between Oxygen Sensors and Air-Fuel Ratio Sensors?<\/h2>\n\n\n\n<p>Newer vehicles may come with air-fuel ratio sensors. Also called wide-ratio air-fuel (WRAF) sensors and wideband oxygen sensors, this oxygen sensor variant doesn&rsquo;t generate just two voltage signals (high and low).<\/p>\n\n\n\n<p>Instead, air-fuel ratio sensors alter their signal to directly reflect the oxygen content in the exhaust. They can take more accurate measurements and can even detect very lean air-fuel mixtures, leading to greater fuel efficiency.<\/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=\"Air Fuel Sensors versus Oxygen Sensors\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/PaliFhkRHcA?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<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0131 Code?<\/h2>\n\n\n\n<p>There are various issues that can lead to the PCM logging a code P0131. If you get this code, some of the possible causes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Issues in the oxygen sensor or air-fuel ratio sensor<\/li>\n\n\n\n<li>Defects in the circuit for the oxygen sensor or air-fuel ratio sensor heater<\/li>\n\n\n\n<li>Vacuum leaks or a leak in the <a href=\"https:\/\/www.carparts.com\/exhaust-system\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust system\">exhaust system<\/a><\/li>\n\n\n\n<li>Low fuel pressure<\/li>\n\n\n\n<li>Problem with a sensor other sensors (e.g., a bad mass airflow sensor)<\/li>\n\n\n\n<li>Problems with the sensor circuit<\/li>\n\n\n\n<li>Out-of-date PCM software<\/li>\n\n\n\n<li>Faulty PCM<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0131 Code?<\/h2>\n\n\n\n<p>The PCM relies on data from the oxygen sensor or air-fuel ratio sensor to regulate the engine&rsquo;s fuel intake. If a sensor malfunctions, it will disrupt the proper operation of the engine.<\/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>Common symptoms attributed to a P0131 code include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Check Engine Light\">Check Engine Light<\/a><\/li>\n\n\n\n<li>Engine may idle, run rough, or die<\/li>\n\n\n\n<li>Decreased fuel economy<\/li>\n\n\n\n<li>Increased tailpipe emissions<\/li>\n<\/ul>\n\n\n\n<p>Occasionally, the vehicle may display no symptoms.<\/p>\n\n\n\n<p><strong><em>Note: <\/em><\/strong><em>If there are other codes stored in addition to P0131, the causes and symptoms may differ from those listed <a href=\"https:\/\/www.carparts.com\/blog\/p0132-oxygen-sensor-circuit-high-voltage-bank-1-sensor-1\/#More_About_O2_Sensors_and_Rationality_Checks\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"here\">here<\/a>.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0131 Code<\/h2>\n\n\n\n<p>From a defective air-fuel ratio sensor to issues with the sensor circuit, many problems can log the P0131 code. This can make it tricky to diagnose the problem.<\/p>\n\n\n\n<p>Check out this helpful video reference to find out what the diagnostic process involves:<\/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=\"Honda Civic P0131 &amp; 02 Sensor Diagnosis\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/a19wkJ3bF2o?start=1339&amp;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<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=\"2004 Chevy Truck O2 Sensor Fuel Trim codes P0131, P0134, P0171, P1133 part 1\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/k_KJuqR1gKQ?start=2&amp;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<h2 class=\"wp-block-heading\">How to Fix the P0131 Code<\/h2>\n\n\n\n<p>Once you&rsquo;ve established what caused the P0131 code, find out how to resolve it by doing further research online. Look for speci<\/p>\n\n\n\n<p>fic fixes that have proven successful for other vehicle owners who have had the same code and the same underlying cause.<\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p0137-code-oxygen-sensor-circuit-low-voltage-bank-1-sensor-2\/\" target=\"_self\" rel=\"dofollow\" class=\"uc9baa399998583ecf77169aa6e669bcb\"><style> .uc9baa399998583ecf77169aa6e669bcb { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .uc9baa399998583ecf77169aa6e669bcb:active, .uc9baa399998583ecf77169aa6e669bcb:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .uc9baa399998583ecf77169aa6e669bcb { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .uc9baa399998583ecf77169aa6e669bcb .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .uc9baa399998583ecf77169aa6e669bcb .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .uc9baa399998583ecf77169aa6e669bcb:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P0137 Code: Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 2)<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>For instance, one of the most common fixes for the P0131 code in a Ford Focus would be to replace the oxygen sensor (provided that the sensor was faulty and had been the one causing the code to set). But that solution may not be as effective for a P0131 in a Toyota, Chevy, or any other vehicle make&mdash;especially if what caused the code was a different problem (or set of problems).<\/p>\n\n\n\n<p>If you are new to working on your vehicle, we suggest that you use some of these online auto repair resources and guides to boost your know-how. You may also get an ALLDATA single-vehicle subscription, which will prove extremely helpful for this and all future repairs.<\/p>\n\n\n\n<p>Aside from what triggered the P0131 code, the vehicle&rsquo;s make and model must also be considered to resolve the issue. This is because automakers may set specific repair instructions that may differ from those you found online (that are applicable to a different vehicle).<\/p>\n\n\n\n<p>Check your owner&rsquo;s manual before addressing the code to avoid issues.<\/p>\n\n\n\n<p>If you are not confident with your automotive know-how or DIY skills, it may be best to let your mechanic address the DTC.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Do Oxygen Sensors Do?<\/h2>\n\n\n\n<p>O2 sensors have been around since 1975 but became the order of things by the early 80s with feedback fuel systems &ndash; and the O2 is the feedback element of the system.<\/p>\n\n\n\n<p>To begin with, Bank 1 is where the #1 spark plug is. Always. Again, determine which bank is which FIRST or you&rsquo;ll waste a lot of time and effort.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"498\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/ford-dodge-gm-o2-sensor-diagram-1024x498.jpg\" alt=\"diagram of a ford dodge gm oxygen sensor\" class=\"wp-image-87763\" style=\"width:1024px;height:498px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/ford-dodge-gm-o2-sensor-diagram-1024x498.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/ford-dodge-gm-o2-sensor-diagram-300x146.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/ford-dodge-gm-o2-sensor-diagram-768x373.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/ford-dodge-gm-o2-sensor-diagram-150x73.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/ford-dodge-gm-o2-sensor-diagram.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Notice that in this diagram, O2 sensor 1\/1 is the upstream sensor on Bank 1 (different for a Ford than for a Chevy or a Dodge), and O2 sensor 1\/2 is the downstream sensor on Bank 1. O2 2\/1 is upstream on Bank 2 and O2 2\/2 is downstream on Bank 2. Front wheel drive vehicles can be even more confusing, but when you find cylinder #1 you&rsquo;ve found Bank 1. If there&rsquo;s only one bank, that&rsquo;ll be Bank 1. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>Always make sure you know which bank is which before you do any hands-on testing if you don&rsquo;t want to do unnecessary work or buy unnecessary parts.<\/p>\n\n\n<style>.kadence-column12633_af2708-9b > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column12633_af2708-9b > .kt-inside-inner-col,.kadence-column12633_af2708-9b > .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-column12633_af2708-9b > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column12633_af2708-9b > .kt-inside-inner-col{flex-direction:column;}.kadence-column12633_af2708-9b > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column12633_af2708-9b > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column12633_af2708-9b{position:relative;}@media all and (max-width: 1024px){.kadence-column12633_af2708-9b > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column12633_af2708-9b > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column12633_af2708-9b kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id12633_21fa65-ca > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id12633_21fa65-ca > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id12633_21fa65-ca > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-bottom:20px;padding-left:16px;padding-right:32px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id12633_21fa65-ca > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id12633_21fa65-ca .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id12633_21fa65-ca .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id12633_21fa65-ca .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id12633_21fa65-ca .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id12633_21fa65-ca .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id12633_21fa65-ca .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id12633_21fa65-ca > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id12633_21fa65-ca .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id12633_21fa65-ca .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id12633_21fa65-ca > .kt-row-column-wrap{padding-top:28px;padding-bottom:25px;padding-left:16px;padding-right:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id12633_21fa65-ca .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id12633_21fa65-ca .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id12633_21fa65-ca alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column12633_505c24-fe > .kt-inside-inner-col{display:flex;}.kadence-column12633_505c24-fe > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column12633_505c24-fe > .kt-inside-inner-col,.kadence-column12633_505c24-fe > .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-column12633_505c24-fe > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column12633_505c24-fe > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column12633_505c24-fe > .kt-inside-inner-col > *, .kadence-column12633_505c24-fe > .kt-inside-inner-col > figure.wp-block-image, .kadence-column12633_505c24-fe > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column12633_505c24-fe > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column12633_505c24-fe > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column12633_505c24-fe{position:relative;}@media all and (max-width: 1024px){.kadence-column12633_505c24-fe > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column12633_505c24-fe > .kt-inside-inner-col > *, .kadence-column12633_505c24-fe > .kt-inside-inner-col > figure.wp-block-image, .kadence-column12633_505c24-fe > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column12633_505c24-fe > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column12633_505c24-fe > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column12633_505c24-fe > .kt-inside-inner-col > *, .kadence-column12633_505c24-fe > .kt-inside-inner-col > figure.wp-block-image, .kadence-column12633_505c24-fe > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column12633_505c24-fe > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column12633_505c24-fe kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image12633_93d008-e0.kb-image-is-ratio-size, .kb-image12633_93d008-e0 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image12633_93d008-e0.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image12633_93d008-e0 .kb-image-is-ratio-size{align-self:unset;}.kb-image12633_93d008-e0 figure{max-width:45px;}.kb-image12633_93d008-e0 .image-is-svg, .kb-image12633_93d008-e0 .image-is-svg img{width:100%;}.kb-image12633_93d008-e0 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image12633_93d008-e0\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column12633_2630de-ff > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column12633_2630de-ff > .kt-inside-inner-col,.kadence-column12633_2630de-ff > .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-column12633_2630de-ff > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column12633_2630de-ff > .kt-inside-inner-col{flex-direction:column;}.kadence-column12633_2630de-ff > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column12633_2630de-ff > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column12633_2630de-ff{position:relative;}@media all and (max-width: 1024px){.kadence-column12633_2630de-ff > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column12633_2630de-ff > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column12633_2630de-ff inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\n            Always make sure you know which bank is which before you do any hands-on testing if you don&rsquo;t want to do unnecessary work or buy unnecessary parts.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p0136-code-o2-sensor-circuit-bank-1-sensor-2\/\" target=\"_self\" rel=\"dofollow\" class=\"u455fc90df787948760ef9583aac4f441\"><style> .u455fc90df787948760ef9583aac4f441 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .u455fc90df787948760ef9583aac4f441:active, .u455fc90df787948760ef9583aac4f441:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u455fc90df787948760ef9583aac4f441 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u455fc90df787948760ef9583aac4f441 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u455fc90df787948760ef9583aac4f441 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u455fc90df787948760ef9583aac4f441:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P0136 Code: O2 Sensor Circuit (Bank 1, Sensor 2)<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>The inside area of the ceramic zirconia bulb within the conventional O2 sensor is exposed to the atmosphere by way of a small vent where the wires enter the sensor. The outside surface of the bulb is exposed to exhaust gas, and since ceramic zirconia is an electrolyte, the conventional O2 sensor literally creates its own voltage as the O2 levels within the bulb and the O2 in the exhaust fluctuate, providing a 0.2-0.8 volt signal which the ECM\/PCM interprets. The O2 sensor reacts very quickly to very minor changes in O2 in the exhaust stream.<\/p>\n\n\n\n<p>The more O2 that is in the exhaust stream, the lower the voltage &ndash; the less O2 in the exhaust, the higher the voltage (again, this range is about 0.2-0.8).<\/p>\n\n\n\n<p>With the advent of OBD2, it became evident that the catalyst needed a sensor to monitor its ability to store oxygen &ndash; which is what the downstream O2 sensor is there for.<\/p>\n\n\n\n<p>Both the upstream and downstream sensors have an internal heater (sort of like a diesel glow plug but with a bit more resistance), because O2 sensors must be above 600&deg;F to operate. If the heater is burned out, you&rsquo;ll typically get a code for that, because the ECM\/PCM measure current flow through the heater. That being said, if the O2 sensor is running too cold for some reason, it won&rsquo;t produce sufficient\/accurate voltage and the ECM\/PCM algorithms are designed to detect that.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"618\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/o2-sensor-pattern-1024x618.jpg\" alt=\"image showing proper o2 sensor pattern\" class=\"wp-image-87764\" style=\"width:1024px;height:618px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/o2-sensor-pattern-1024x618.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/o2-sensor-pattern-300x181.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/o2-sensor-pattern-768x463.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/o2-sensor-pattern-150x91.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/o2-sensor-pattern.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">This chart shows a proper O2 sensor pattern. Notice that in this example, the sensor is responding to the PCM&rsquo;s constant short fuel trim adjustments by switching rapidly. Each horizontal block is 1 second of time. This is the proper amplitude (up-down sweep) for a healthy O2 sensor and it&rsquo;s also a healthy frequency (a good number of rapid switches from rich to lean). If either the amplitude or the frequency of this switching deviates from the PCM algorithm&rsquo;s accepted threshold, a code will be set. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Order a Replacement Oxygen Sensor From the Comfort of Your Home<\/h2>\n\n\n\n<p>If your vehicle has a P0131 code caused by a malfunctioning oxygen sensor, it&rsquo;s best to stop driving it until you replace the faulty part. You want to avoid aggravating the issue that triggered the P0131 code in the first place. Thankfully, ordering a compatible replacement oxygen sensor is simple at CarParts.com.<\/p>\n\n\n\n<p><a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a> takes the guesswork out of shopping for compatible oxygen sensors. Our built-in vehicle selector lets you enter your vehicle&rsquo;s year, make, and model to see only parts that will fit. Our oxygen sensors are ready to ship from one of our strategically located warehouses so you can get your new parts in as fast as two business days if you live in the continental U.S. and order before 12 p.m. ET.<\/p>\n\n\n\n<p>When it comes to competitively priced oxygen sensors, CarParts.com has you covered. Check out the best deals on <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensors\">oxygen sensors<\/a> at CarParts.com and order today!<\/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\/mass-air-flow-sensor\" target=\"_blank\" aria-label=\"Mass Air Flow 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\/repb316709_1\" alt=\"Mass Air Flow Sensor\">\n<strong>Mass Air Flow Sensor<\/strong>\n<\/a>\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\/set-repb960901-2_1\" alt=\"Oxygen Sensor\">\n<strong>Oxygen Sensor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" aria-label=\"Engine Control Module\" 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\/a1721000_1\" alt=\"Engine Control Module\">\n<strong>Engine Control Module<\/strong>\n<\/a>\n\n<!-- end of editable content -->\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\/catalytic-converter\/evan-fischer\/repn960344\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960344_1\" alt=\"Evan Fischer&reg; &ndash; Rear Catalytic Converter, Federal EPA Standard, 46-State Legal, 2.5L Engine\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960344_1\" alt=\"Evan Fischer&reg; &ndash; Rear Catalytic Converter, Federal EPA Standard, 46-State Legal, 2.5L Engine\"><\/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\/repn960344\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Evan Fischer&reg; &ndash; Rear Catalytic Converter, Federal EPA Standard, 46-State Legal, 2.5L Engine\">Evan Fischer&reg; &ndash; Rear Catalytic Converter, Federal EPA Standard, 46-State Legal, 2.5L Engine<\/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\">$154.99<\/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\/repn960344\" 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\/exhaust-system\/brexhaust\/bo1060075\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/bo1060075_1\" alt=\"BRExhaust&reg; &ndash; 106-0075 Direct-Fit Exhaust Series &ndash; 2003-2009 Exhaust System &ndash; Made of Aluminized Steel\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/bo1060075_1\" alt=\"BRExhaust&reg; &ndash; 106-0075 Direct-Fit Exhaust Series &ndash; 2003-2009 Exhaust System &ndash; Made of Aluminized Steel\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/exhaust-system\/brexhaust\/bo1060075\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"BRExhaust&reg; &ndash; 106-0075 Direct-Fit Exhaust Series &ndash; 2003-2009 Exhaust System &ndash; Made of Aluminized Steel\">BRExhaust&reg; &ndash; 106-0075 Direct-Fit Exhaust Series &ndash; 2003-2009 Exhaust System &ndash; Made of Aluminized Steel<\/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-5.svg\" alt=\"5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$367.00<\/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\/exhaust-system\/brexhaust\/bo1060075\" 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\/engine-control-module\/dorman\/rb318120\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/images\/rb318120_1\" alt=\"Dorman&reg; &ndash; 318-120 OE Solutions Series Engine Control Module - Direct Fit, Sold individually\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/images\/rb318120_1\" alt=\"Dorman&reg; &ndash; 318-120 OE Solutions Series Engine Control Module - Direct Fit, Sold individually\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/engine-control-module\/dorman\/rb318120\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Dorman&reg; &ndash; 318-120 OE Solutions Series Engine Control Module &ndash; Direct Fit, Sold individually\">Dorman&reg; &ndash; 318-120 OE Solutions Series Engine Control Module &ndash; Direct Fit, Sold individually<\/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-0.svg\" alt=\"0 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$231.17<\/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\/engine-control-module\/dorman\/rb318120\" 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\"> 7<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Oxygen sensors measure the amount of oxygen in the exhaust stream. Your car&rsquo;s primary computer, which is often referred to&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0131-o2-sensor-circuit-low-voltage-bank-1-sensor-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":12655,"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":[2607,2985],"class_list":{"0":"post-12633","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-oxygen-sensor-2","9":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0131: O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"The P0131 code warns about a low voltage signal from the oxygen sensor 1 on engine bank 1. 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