{"id":16192,"date":"2021-12-02T01:34:00","date_gmt":"2021-12-02T09:34:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16192"},"modified":"2026-02-17T22:46:16","modified_gmt":"2026-02-18T06:46:16","slug":"p0151-code-o2-sensor-circuit-low-voltage-bank-2-sensor-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0151-code-o2-sensor-circuit-low-voltage-bank-2-sensor-1\/","title":{"rendered":"P0151 Code: O2 Sensor Circuit Low Voltage (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-column16192_d6fca1-30 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16192_d6fca1-30 > .kt-inside-inner-col,.kadence-column16192_d6fca1-30 > .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-column16192_d6fca1-30 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16192_d6fca1-30 > .kt-inside-inner-col{flex-direction:column;}.kadence-column16192_d6fca1-30 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16192_d6fca1-30 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16192_d6fca1-30{position:relative;}@media all and (max-width: 1024px){.kadence-column16192_d6fca1-30 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16192_d6fca1-30 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16192_d6fca1-30 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-6ed372  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-fbe102\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading16192_47ab53-d9, .wp-block-kadence-advancedheading.kt-adv-heading16192_47ab53-d9[data-kb-block=\"kb-adv-heading16192_47ab53-d9\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading16192_47ab53-d9 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading16192_47ab53-d9[data-kb-block=\"kb-adv-heading16192_47ab53-d9\"] 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-heading16192_47ab53-d9 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading16192_47ab53-d9[data-kb-block=\"kb-adv-heading16192_47ab53-d9\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading16192_47ab53-d9 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading16192_47ab53-d9\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DTC P0151 stands for &ldquo;O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1). It indicates the oxygen sensor&rsquo;s voltage is lower than factory specifications for a certain period.<\/li>\n\n\n\n<li>Problems that could trigger the code include a faulty front O2 sensor, O2 sensor circuit problems, a lean running condition, and an exhaust leak.<\/li>\n\n\n\n<li>A lit check engine light, abnormally high fuel consumption, and engine performance problems are some of the symptoms of this trouble code.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\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 codes\">Diagnostic trouble codes<\/a> (DTCs) are set when there&rsquo;s a problem with your car. The codes fall under four categories: powertrain, body, chassis, and network connection. Those starting with &ldquo;P&rdquo; are classified under the powertrain category and are often set when there&rsquo;s a mechanical or electrical failure with various systems involving the engine or transmission.<\/p>\n\n\n\n<p>Fixing a code is not easy, as it requires a deep understanding of the issue. If your scan tool registered the P0151 code, this guide will provide you with the essential things you should know for troubleshooting.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0151 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0151 stands for &ldquo;O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1). It means that the oxygen sensor&rsquo;s voltage has remained lower than factory specifications for a certain amount of time.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/Man-hold-in-hand-faulty-old-oxygen-sensor-of-exhaust-system-focused-view-1024x682.jpg\" alt=\"Man hold in hand faulty old oxygen sensor of exhaust system focused view\" class=\"wp-image-46372\" style=\"width:1024px;height:682px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/Man-hold-in-hand-faulty-old-oxygen-sensor-of-exhaust-system-focused-view-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/Man-hold-in-hand-faulty-old-oxygen-sensor-of-exhaust-system-focused-view-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/Man-hold-in-hand-faulty-old-oxygen-sensor-of-exhaust-system-focused-view-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/Man-hold-in-hand-faulty-old-oxygen-sensor-of-exhaust-system-focused-view-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/Man-hold-in-hand-faulty-old-oxygen-sensor-of-exhaust-system-focused-view-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/Man-hold-in-hand-faulty-old-oxygen-sensor-of-exhaust-system-focused-view-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/Man-hold-in-hand-faulty-old-oxygen-sensor-of-exhaust-system-focused-view.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">P0151 code warns about a fault with the upstream oxygen sensor on Bank 2.<\/figcaption><\/figure>\n\n\n\n<p>The code P0151 is similar to P0136, P0137, and P0131. This code warns about a fault with the upstream oxygen sensor on Bank 2. Bank 2 Sensor 1 is tucked in front of the catalytic converter. It analyzes the amount of oxygen in the exhaust before it enters the catalytic converter. The PCM uses this information to adjust the vehicle&rsquo;s air-fuel ratio.<\/p>\n\n\n<style>.kadence-column16192_6bf5f9-a9 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16192_6bf5f9-a9 > .kt-inside-inner-col,.kadence-column16192_6bf5f9-a9 > .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-column16192_6bf5f9-a9 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16192_6bf5f9-a9 > .kt-inside-inner-col{flex-direction:column;}.kadence-column16192_6bf5f9-a9 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16192_6bf5f9-a9 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16192_6bf5f9-a9{position:relative;}@media all and (max-width: 1024px){.kadence-column16192_6bf5f9-a9 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16192_6bf5f9-a9 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16192_6bf5f9-a9 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-id16192_16696f-f0 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id16192_16696f-f0 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id16192_16696f-f0 > .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-id16192_16696f-f0 > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id16192_16696f-f0 .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id16192_16696f-f0 .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id16192_16696f-f0 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id16192_16696f-f0 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id16192_16696f-f0 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id16192_16696f-f0 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id16192_16696f-f0 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id16192_16696f-f0 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id16192_16696f-f0 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id16192_16696f-f0 > .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-id16192_16696f-f0 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id16192_16696f-f0 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id16192_16696f-f0 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-column16192_d38e9b-6f > .kt-inside-inner-col{display:flex;}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col,.kadence-column16192_d38e9b-6f > .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-column16192_d38e9b-6f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col > *, .kadence-column16192_d38e9b-6f > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16192_d38e9b-6f > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16192_d38e9b-6f{position:relative;}@media all and (max-width: 1024px){.kadence-column16192_d38e9b-6f > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column16192_d38e9b-6f > .kt-inside-inner-col > *, .kadence-column16192_d38e9b-6f > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16192_d38e9b-6f > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column16192_d38e9b-6f > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col > *, .kadence-column16192_d38e9b-6f > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16192_d38e9b-6f > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16192_d38e9b-6f > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16192_d38e9b-6f kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image16192_d541e3-db.kb-image-is-ratio-size, .kb-image16192_d541e3-db .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image16192_d541e3-db.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image16192_d541e3-db .kb-image-is-ratio-size{align-self:unset;}.kb-image16192_d541e3-db figure{max-width:45px;}.kb-image16192_d541e3-db .image-is-svg, .kb-image16192_d541e3-db .image-is-svg img{width:100%;}.kb-image16192_d541e3-db .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image16192_d541e3-db\"><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-column16192_bd832d-cd > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16192_bd832d-cd > .kt-inside-inner-col,.kadence-column16192_bd832d-cd > .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-column16192_bd832d-cd > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16192_bd832d-cd > .kt-inside-inner-col{flex-direction:column;}.kadence-column16192_bd832d-cd > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16192_bd832d-cd > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16192_bd832d-cd{position:relative;}@media all and (max-width: 1024px){.kadence-column16192_bd832d-cd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16192_bd832d-cd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16192_bd832d-cd 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>\nSince the upstream O2 sensor is the primary feedback for fuel control, there may be other codes stored along with P0151, and the engine may remain in open loop as a result.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<p>To improve emissions, car manufacturers equip cars with three-way catalytic converters, which recombines toxic compounds into safer emissions through a chemical process.<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> constantly tests the <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a> by comparing the voltage signals of the upstream and downstream O2 sensors. If the system detects that the upstream sensor&rsquo;s signal is lower than specifications, it recognizes it as &ldquo;O2 Sensor Circuit Low Voltage.&rdquo; The PCM will immediately illuminate the check engine light and set the P0151 code.<\/p>\n\n\n\n<p>You can find more helpful technical information in our in-depth discussion about <a href=\"https:\/\/www.carparts.com\/blog\/p0138-code-o2-sensor-circuit-high-voltage-bank-1-sensor-2\/#How_the_Downstream_Oxygen_Sensor_Can_Trigger_P0138\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensors and DTCs\">oxygen sensors and DTCs<\/a>.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0151 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<div class=\"cp-search\">\n<div align=\"center\"><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\"><\/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\t<input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\">\n        <input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of Code P0151?<\/h2>\n\n\n\n<p>There are multiple factors that could cause the activation of the engine code P0151. Below are its most likely causes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A faulty front O2 sensor (bank 2)<\/li>\n\n\n\n<li>An issue with the O2 sensor&rsquo;s circuit<\/li>\n\n\n\n<li>A lean running condition<\/li>\n\n\n\n<li>An exhaust leak<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0151 Code?<\/h2>\n\n\n\n<p>If you&rsquo;re reading the P0151 code on your OBD scanner, you have a high chance of experiencing these symptoms:<\/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=\"Illuminated check engine light\">Illuminated check engine light<\/a><\/li>\n\n\n\n<li>Abnormally high fuel consumption<\/li>\n\n\n\n<li>Engine performance problems, such as rough running and <a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-accelerate-properly-when-i-push-the-gas-causes\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"poor acceleration\">poor acceleration<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0151 Code<\/h2>\n\n\n\n<p>There are different ways of diagnosing the OBD code P0151 as there different causes that could trigger it. There is no universal diagnosis as cars are not built to look and operate the same. It would be very helpful to consider consulting a certified mechanic for you to avoid committing expensive mistakes.<\/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 P0151 Code<\/h2>\n\n\n\n<p>Clearing the P0151 code can be challenging as there are various causes and symptoms. If you don&rsquo;t have the proper DIY skills and knowledge about the code, it is recommended that you let licensed mechanics handle the job for you.<\/p>\n\n\n\n<p>If you&rsquo;re confident of your knowledge about this specific DTC code, you can address it by using <a href=\"https:\/\/www.carparts.com\/blog\/best-online-resources-to-help-you-learn-how-to-fix-cars\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"online auto repair resources\">online auto repair resources<\/a> and guides like ALLDATA. An ALLDATA subscription will give you access to a huge database of information about various faults in your vehicle. Remember to verify key information about your vehicle before proceeding to diagnostics and troubleshooting using the repair manual.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a New Oxygen Sensor for Your Ride<\/h2>\n\n\n\n<p>If your OBD scan tool reads a P0151 code, you&rsquo;re possibly dealing with a bad front oxygen sensor in bank 2.&nbsp; Once you&rsquo;ve confirmed this, have this particular oxygen sensor replaced as soon as possible. Luckily, you can easily find a top-notch oxygen sensor here at <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>Our website offers a great selection of <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensors\">oxygen sensors<\/a> that come as direct-fit replacements for a wide range of make and models. Simply go to our website and look for our vehicle selector. Input your ride&rsquo;s specific details, and check out the right oxygen sensor replacement for your vehicle.<\/p>\n\n\n\n<p>All our products come with a low-price guarantee, so you don&rsquo;t have to break the bank just to get an oxygen sensor for your ride. Plus, they are sourced from top brands in the industry. You don&rsquo;t have to worry about functionality because they work just like your factory unit.<\/p>\n\n\n\n<p>Need parts delivered as soon as possible? Our distribution centers are strategically located across the country, so you can expect your order to arrive in just a few days.<\/p>\n\n\n\n<p>Don&rsquo;t ruin your trip all because of a bad oxygen sensor. Check out our selection 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\/catalytic-converter\" target=\"_blank\" aria-label=\"Catalytic Converter\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repi960303_1\" alt=\"Catalytic Converter\">\n<strong>Catalytic Converter<\/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\n<\/div>\n\n\n\n<div class=\"shop-project\">\n\n    <h2>Shop this Project<\/h2>\n\n    <ul class=\"shop-project-list\">\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repb960901\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repb960901_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated, With Female Connector\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repb960901_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated, With Female Connector\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repb960901\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated, With Female Connector\">DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated, With Female Connector<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$22.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repb960901\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960915_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960915_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\">DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$49.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/set-repn960335ss-2\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-repn960335ss-2_1\" alt=\"Evan Fischer&reg; &ndash; Front and Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME)\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-repn960335ss-2_1\" alt=\"Evan Fischer&reg; &ndash; Front and Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME)\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/set-repn960335ss-2\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Evan Fischer&reg; &ndash; Front and Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME)\">Evan Fischer&reg; &ndash; Front and Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME)<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$299.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/set-repn960335ss-2\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \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>Diagnostic trouble codes (DTCs) are set when there&rsquo;s a problem with your car. The codes fall under four categories: powertrain,&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0151-code-o2-sensor-circuit-low-voltage-bank-2-sensor-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":16210,"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-16192","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>P0151 Code: O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Code P0151 is set when the signal from the O2 sensor is below specifications. Clear this code immediately to prevent serious engine issues.\" \/>\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\/p0151-code-o2-sensor-circuit-low-voltage-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=\"P0151 Code: O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1) - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Code P0151 is set when the signal from the O2 sensor is below specifications. Clear this code immediately to prevent serious engine issues.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0151-code-o2-sensor-circuit-low-voltage-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=\"2021-12-02T09:34:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-18T06:46:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-2-1.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"998\" \/>\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\\\/p0151-code-o2-sensor-circuit-low-voltage-bank-2-sensor-1\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0151-code-o2-sensor-circuit-low-voltage-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. 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