{"id":16458,"date":"2022-06-05T18:38:00","date_gmt":"2022-06-06T01:38:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16458"},"modified":"2026-02-10T22:19:57","modified_gmt":"2026-02-11T06:19:57","slug":"p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/","title":{"rendered":"P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column16458_89eb0e-bf > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16458_89eb0e-bf > .kt-inside-inner-col,.kadence-column16458_89eb0e-bf > .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-column16458_89eb0e-bf > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16458_89eb0e-bf > .kt-inside-inner-col{flex-direction:column;}.kadence-column16458_89eb0e-bf > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16458_89eb0e-bf > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16458_89eb0e-bf{position:relative;}@media all and (max-width: 1024px){.kadence-column16458_89eb0e-bf > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16458_89eb0e-bf > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16458_89eb0e-bf inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-3439b0  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-ead878\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading16458_d51528-57, .wp-block-kadence-advancedheading.kt-adv-heading16458_d51528-57[data-kb-block=\"kb-adv-heading16458_d51528-57\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading16458_d51528-57 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading16458_d51528-57[data-kb-block=\"kb-adv-heading16458_d51528-57\"] 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-heading16458_d51528-57 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading16458_d51528-57[data-kb-block=\"kb-adv-heading16458_d51528-57\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading16458_d51528-57 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading16458_d51528-57\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The P0040 code stands for &ldquo;O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 Sensor 1.&rdquo; It&rsquo;s set when the PCM perceives that the wiring harnesses from the sensors have been crossed.<\/li>\n\n\n\n<li>Some possible triggers for the code include a misrouted oxygen sensor wiring, a damaged oxygen sensor wiring, and a failed PCM.<\/li>\n\n\n\n<li>Some symptoms to look out for are an illuminated check engine light, decreased engine performance, and reduced fuel mileage.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>One of the less common diagnostic trouble codes you may come across is the P0040 code. Here is some basic information about what this code means for your vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0040 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) P0040 stands for &ldquo;O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 Sensor 1.&rdquo;<\/p>\n\n\n\n<p>The P0040 code is set when the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> or PCM perceives that the wiring harnesses from the sensors have been crossed. It determines this through a logic-based strategy.<\/p>\n\n\n\n<p>On most vehicle platforms it&rsquo;s not possible to transpose the <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"O2 sensor\">O2 sensor<\/a> connections because they simply won&rsquo;t reach &ndash; this transposing of sensor connections typically only happens when the upstream sensor connectors are near enough together to be transposed. Both sensor connections look exactly alike, and if they are near enough to one another and weren&rsquo;t marked when they were disconnected, they can be transposed.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-on-modern-car-1024x683.jpeg\" alt=\"oxygen sensor on modern car\" class=\"wp-image-16467\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-on-modern-car-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-on-modern-car-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-on-modern-car-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-on-modern-car-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-on-modern-car-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-on-modern-car.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The P0040 code is set when the powertrain control module or PCM perceives that the wiring harnesses from the sensors have been crossed.<\/figcaption><\/figure>\n\n\n\n<p>Of course, wiring harness damage or improper wiring harness patching after damage can cause a situation like this if, for example, the wires were connected wrong during a repair, but wire color coding will generally prevent that from happening. Another possibility would be transposing the wires at the ECM\/PCM connector, which will only happen if the wires at the connector are extracted from the connector shell and then reinserted.<\/p>\n\n\n\n<p>Since the ECM\/PCM is responding to O2 sensor signals to maintain proper mixture on each bank, it&rsquo;s fairly easy for the ECM\/PCM to determine that the sensor connections are reversed. The O2 signals should both be switching very near zero.<\/p>\n\n\n\n<p>Code P0040 refers to a condition wherein the first oxygen (O2) sensors downstream from the engine have swapped wiring. For this trouble code, sensor 1 is the first oxygen sensor in the <a href=\"https:\/\/www.carparts.com\/exhaust-manifold\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust manifold\">exhaust manifold<\/a> or downstream from it. It will be upstream from the catalytic converter. Bank 1 refers to the bank of the engine that contains cylinder #1.<\/p>\n\n\n\n<p>The PCM detects this error by monitoring oxygen sensor readings. For example, if more fuel is injected into bank 2 of the engine but readings show that the bank 1 oxygen sensor is reacting instead of the bank 2 oxygen sensor, the P0040 code is set.<\/p>\n\n\n\n<p>This trouble code is uncommon and only applies to vehicles with engines that have two or more banks of cylinders. Vehicles with inline engines will not get this code. The code P0041 is related to this code.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"941\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/automotive-ecm-monitoring-o2-readings-1024x941.jpg\" alt=\"automotive ecm monitoring o2 readings\" class=\"wp-image-69744\" style=\"width:1024px;height:941px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/automotive-ecm-monitoring-o2-readings-1024x941.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/automotive-ecm-monitoring-o2-readings-300x276.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/automotive-ecm-monitoring-o2-readings-768x705.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/automotive-ecm-monitoring-o2-readings-1536x1411.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/automotive-ecm-monitoring-o2-readings-150x138.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/automotive-ecm-monitoring-o2-readings.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The PCM detects this error by monitoring oxygen sensor readings.<\/figcaption><\/figure>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0040 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0040 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Misrouted oxygen sensor wiring&nbsp;<\/li>\n\n\n\n<li>Crossed, damaged, and\/or shorted oxygen sensor wiring<\/li>\n\n\n\n<li>Failed PCM (possible but less likely)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0040 Code?<\/h2>\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=\"Illuminated check engine light\">Illuminated check engine light<\/a><\/li>\n\n\n\n<li>Decreased engine performance<\/li>\n\n\n\n<li>Reduced fuel mileage<\/li>\n\n\n\n<li>Rough idle or rough running<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0040 Code<\/h2>\n\n\n\n<p>Pinpointing the underlying cause of the P0040 code can be tricky, especially without the proper tools or expertise of a mechanic. Most of the time, your best option is to bring your vehicle to an auto repair shop to get an accurate diagnosis from a professional. You may also get more information about possible diagnostic procedures by consulting a repair manual or an online database for factory repair information.<\/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=\"Check Engine Codes with a Scan Tool\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/R4p55pvePeU?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<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0040 Code<\/h2>\n\n\n\n<p>The P0040 code is a generic trouble code that may apply to various makes and models. It may be possible for vehicles from different manufacturers to present similar symptoms for the same code. However, that does not mean that their repair process will be the same. For instance, the steps to test and repair the underlying cause of a P0040 <a href=\"https:\/\/www.carparts.com\/chevrolet\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Chevy\">Chevy<\/a> code may be completely different from that of a P0040 <a href=\"https:\/\/www.carparts.com\/ford\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Ford\">Ford<\/a> code&rsquo;s troubleshooting process.<\/p>\n\n\n\n<p>If you&rsquo;re an advanced DIYer who&rsquo;d like to fix this code on your own, it will be helpful to refer to your vehicle&rsquo;s <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual\">repair manual<\/a> or get factory vehicle repair information from an online database.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fuel Trim and P0040<\/h2>\n\n\n\n<p>Fuel trim is the ECM\/PCM&rsquo;s fuel mixture adjustment indicator that is visible on a scan tool live data feed. The ECM\/PCM performs fuel trim Correction by modifying injector pulse. For a detailed, technical understanding of fuel trim, read our discussion about <a href=\"https:\/\/www.carparts.com\/blog\/p0172-code-fuel-system-too-rich-bank-1\/#About_Long_Term_and_Short_Term_Fuel_Trim\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"long term fuel trim and short term fuel trim\">long term fuel trim and short term fuel trim<\/a>.<\/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>Long term fuel trim is a coarse adjustment factor that will slowly ratchet in the same direction as short fuel trim until short fuel trim returns to the zero range.<\/p>\n\n\n\n<p>O2 sensor voltage input determines what the ECM\/PCM does with fuel trim, and that&rsquo;s important where the P0040 code is concerned.<\/p>\n\n\n\n<p>If the ECM\/PCM is correcting for a rich condition on one bank and that bank keeps getting richer and if it&rsquo;s correcting for a lean condition on the opposite bank and that bank keeps getting leaner, the fuel trims will be at something like +30 on one bank and -30 on the other bank even though the O2 sensors themselves are providing accurate information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Find a Replacement Oxygen Sensor For Your Vehicle to Fix DTC P0040<\/h2>\n\n\n\n<p>Because some of the most common causes for DTC P0040 include bad or misrouted oxygen sensor wiring, one of the best ways to fix the code is to have the sensor repaired or replaced.<\/p>\n\n\n\n<p>Fortunately, narrowing the search to find a sensor that fits the specifications of your ride is easy with the help of <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>To start, fill out our vehicle selector with your ride&rsquo;s details to narrow down our catalog to compatible oxygen sensors. Then, toggle the search filters according to your preferred brand, price, and features. This way, you&rsquo;ll have a much easier time finding auto parts compatible with your vehicle.<\/p>\n\n\n\n<p>We make it a point to source our oxygen sensors from the most trusted brands in the industry to ensure they&rsquo;re built to last. They come with a low-price guarantee, so don&rsquo;t worry about going over budget. If you have any questions, don&rsquo;t hesitate to contact our team via our toll-free hotline.<br>Fix DTC P0040 by getting your hands on a replacement <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensor\">oxygen sensor<\/a> now at CarParts.com.<\/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  \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\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\n<strong>Oxygen Sensor<\/strong> \n\n    <\/a>  \n\n    <a href=\"https:\/\/www.carparts.com\/exhaust-manifold\" target=\"_blank\" aria-label=\"exhaust-manifold\" rel=\"noopener\"> \n\n        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_210,w_210,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repf960714_1\" alt=\"exhaust-manifold\"> \n\n<strong>Exhaust Manifold<\/strong> \n\n    <\/a>  \n\n \n\n     <!-- end of editable content --> \n\n  \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\/engine-control-module\/a1-cardone\/a1777747\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/a1777747_1\" alt=\"A1 Cardone&reg; &ndash; 77-7747 Reman Series Engine Control Module &ndash; Direct Fit, Sold individually\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/a1777747_1\" alt=\"A1 Cardone&reg; &ndash; 77-7747 Reman Series Engine Control Module &ndash; 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\/a1-cardone\/a1777747\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"A1 Cardone&reg; &ndash; 77-7747 Reman Series Engine Control Module &ndash; Direct Fit, Sold individually\">A1 Cardone&reg; &ndash; 77-7747 Reman 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-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$95.49<\/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\/a1-cardone\/a1777747\" 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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>One of the less common diagnostic trouble codes you may come across is the P0040 code. Here is some basic&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":16465,"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-16458","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 v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 Sensor 1 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Having trouble with the diagnostic trouble code P0040? Find out what it means and get to know its common causes and symptoms with this short guide.\" \/>\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\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 Sensor 1 - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Having trouble with the diagnostic trouble code P0040? Find out what it means and get to know its common causes and symptoms with this short guide.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/\" \/>\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=\"2022-06-06T01:38:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-11T06:19:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-8-1024x683.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"683\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team, Richard McCuistian, ASE Certified Master Automobile Technician\" \/>\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=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/\"},\"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. Guided by CarParts.com&#039;s thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.\",\"knowsAbout\":\"Auto Repair, Car Maintenance, Auto Parts, Car Reviews\",\"publishingPrinciples\":\"\\\/blog\\\/our-team\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/thecpteam\\\/\",\"sameAs\":\"https:\\\/\\\/www.facebook.com\\\/carpartscom, https:\\\/\\\/twitter.com\\\/CarPartscom, https:\\\/\\\/www.youtube.com\\\/@CarPartscomOfficial\\\/, https:\\\/\\\/www.instagram.com\\\/carpartscom\\\/\"},{\"@type\":\"Person\",\"$id\":\"1651\",\"name\":\"Richard McCuistian\",\"jobTitle\":\"ASE Master Automobile Technician\",\"description\":\"Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.\",\"knowsAbout\":\"Auto Repair, Car Maintenance, Auto Parts, Car Reviews\",\"publishingPrinciples\":\"\\\/blog\\\/our-team\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/richardmccuistian\\\/\",\"sameAs\":\"https:\\\/\\\/www.linkedin.com\\\/in\\\/richard-mccuistian-2681891b\\\/, https:\\\/\\\/www.youtube.com\\\/user\\\/McCuistian\"}],\"headline\":\"P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\\\/Bank 2 Sensor 1\",\"datePublished\":\"2022-06-06T01:38:00+00:00\",\"dateModified\":\"2026-02-11T06:19:57+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/\"},\"wordCount\":1166,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2020\\\/09\\\/oxygen-sensor-8.jpeg\",\"keywords\":[\"oxygen-sensor\"],\"articleSection\":[\"OBD-II Trouble Codes\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/\",\"name\":\"P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\\\/Bank 2 Sensor 1 - In The Garage with CarParts.com\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2020\\\/09\\\/oxygen-sensor-8.jpeg\",\"datePublished\":\"2022-06-06T01:38:00+00:00\",\"dateModified\":\"2026-02-11T06:19:57+00:00\",\"description\":\"Having trouble with the diagnostic trouble code P0040? Find out what it means and get to know its common causes and symptoms with this short guide.\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2020\\\/09\\\/oxygen-sensor-8.jpeg\",\"contentUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2020\\\/09\\\/oxygen-sensor-8.jpeg\",\"width\":1500,\"height\":1000,\"caption\":\"oxygen sensor 8\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/\",\"name\":\"In The Garage with CarParts.com\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\",\"name\":\"CarParts.com\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/cp-itg-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/cp-itg-logo.png\",\"width\":2048,\"height\":398,\"caption\":\"CarParts.com\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/carpartscom\",\"https:\\\/\\\/x.com\\\/carpartscom\",\"https:\\\/\\\/www.instagram.com\\\/carpartscom\",\"https:\\\/\\\/www.youtube.com\\\/@CarPartscomOfficial\\\/\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#\\\/schema\\\/person\\\/9f8a8b00e1b9f62f86295617b525e1f0\",\"name\":\"CarParts.com Research Team\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/thecpteam.jpg485c93be26f8b27acc17cbe4a2313397\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/thecpteam.jpg\",\"contentUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/thecpteam.jpg\",\"caption\":\"CarParts.com Research Team\"},\"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. 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\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 Sensor 1 - In The Garage with CarParts.com","description":"Having trouble with the diagnostic trouble code P0040? Find out what it means and get to know its common causes and symptoms with this short guide.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/","og_locale":"en_US","og_type":"article","og_title":"P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 Sensor 1 - In The Garage with CarParts.com","og_description":"Having trouble with the diagnostic trouble code P0040? Find out what it means and get to know its common causes and symptoms with this short guide.","og_url":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/","og_site_name":"In The Garage with CarParts.com","article_publisher":"https:\/\/www.facebook.com\/carpartscom","article_author":"https:\/\/www.facebook.com\/carpartscom","article_published_time":"2022-06-06T01:38:00+00:00","article_modified_time":"2026-02-11T06:19:57+00:00","og_image":[{"width":1024,"height":683,"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-8-1024x683.jpeg","type":"image\/jpeg"}],"author":"CarParts.com Research Team, Richard McCuistian, ASE Certified Master Automobile Technician","twitter_card":"summary_large_image","twitter_creator":"@https:\/\/twitter.com\/CarPartscom","twitter_site":"@carpartscom","twitter_misc":{"Written by":"CarParts.com Research Team","Est. reading time":"8 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/#article","isPartOf":{"@id":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/"},"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. Guided by CarParts.com&#039;s thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.","knowsAbout":"Auto Repair, Car Maintenance, Auto Parts, Car Reviews","publishingPrinciples":"\/blog\/our-team\/","url":"https:\/\/www.carparts.com\/blog\/author\/thecpteam\/","sameAs":"https:\/\/www.facebook.com\/carpartscom, https:\/\/twitter.com\/CarPartscom, https:\/\/www.youtube.com\/@CarPartscomOfficial\/, https:\/\/www.instagram.com\/carpartscom\/"},{"@type":"Person","$id":"1651","name":"Richard McCuistian","jobTitle":"ASE Master Automobile Technician","description":"Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.","knowsAbout":"Auto Repair, Car Maintenance, Auto Parts, Car Reviews","publishingPrinciples":"\/blog\/our-team\/","url":"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/","sameAs":"https:\/\/www.linkedin.com\/in\/richard-mccuistian-2681891b\/, https:\/\/www.youtube.com\/user\/McCuistian"}],"headline":"P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 Sensor 1","datePublished":"2022-06-06T01:38:00+00:00","dateModified":"2026-02-11T06:19:57+00:00","mainEntityOfPage":{"@id":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/"},"wordCount":1166,"commentCount":0,"publisher":{"@id":"https:\/\/www.carparts.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/#primaryimage"},"thumbnailUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-8.jpeg","keywords":["oxygen-sensor"],"articleSection":["OBD-II Trouble Codes"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/","url":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/","name":"P0040 Code: O2 Sensor Signals Swapped Bank 1 Sensor 1\/Bank 2 Sensor 1 - In The Garage with CarParts.com","isPartOf":{"@id":"https:\/\/www.carparts.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/#primaryimage"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/#primaryimage"},"thumbnailUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-8.jpeg","datePublished":"2022-06-06T01:38:00+00:00","dateModified":"2026-02-11T06:19:57+00:00","description":"Having trouble with the diagnostic trouble code P0040? Find out what it means and get to know its common causes and symptoms with this short guide.","inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.carparts.com\/blog\/p0040-code-o2-sensor-signals-swapped-bank-1-sensor-1-bank-2-sensor-1\/#primaryimage","url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-8.jpeg","contentUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-8.jpeg","width":1500,"height":1000,"caption":"oxygen sensor 8"},{"@type":"WebSite","@id":"https:\/\/www.carparts.com\/blog\/#website","url":"https:\/\/www.carparts.com\/blog\/","name":"In The Garage with CarParts.com","description":"","publisher":{"@id":"https:\/\/www.carparts.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.carparts.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.carparts.com\/blog\/#organization","name":"CarParts.com","url":"https:\/\/www.carparts.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.carparts.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2025\/03\/cp-itg-logo.png","contentUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2025\/03\/cp-itg-logo.png","width":2048,"height":398,"caption":"CarParts.com"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/carpartscom","https:\/\/x.com\/carpartscom","https:\/\/www.instagram.com\/carpartscom","https:\/\/www.youtube.com\/@CarPartscomOfficial\/"]},{"@type":"Person","@id":"https:\/\/www.carparts.com\/blog\/#\/schema\/person\/9f8a8b00e1b9f62f86295617b525e1f0","name":"CarParts.com Research Team","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg485c93be26f8b27acc17cbe4a2313397","url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg","contentUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg","caption":"CarParts.com Research Team"},"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. 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\/"}]}},"featured_image_src":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-8.jpeg","featured_image_src_square":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-8.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"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""},{"term_id":2985,"user_id":1646,"is_guest":0,"slug":"richardmccuistian","display_name":"Richard McCuistian, ASE Certified Master Automobile Technician","avatar_url":{"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/richard-mccuistian.png","url2x":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/richard-mccuistian.png"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/16458","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/users\/1651"}],"replies":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/comments?post=16458"}],"version-history":[{"count":0,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/16458\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media\/16465"}],"wp:attachment":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media?parent=16458"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/categories?post=16458"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/tags?post=16458"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=16458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}