{"id":16116,"date":"2022-04-13T00:51:00","date_gmt":"2022-04-13T07:51:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16116"},"modified":"2024-06-05T18:32:50","modified_gmt":"2024-06-06T01:32:50","slug":"p2197-code-o2-sensor-signal-biased-stuck-lean-bank-2-sensor-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2197-code-o2-sensor-signal-biased-stuck-lean-bank-2-sensor-1\/","title":{"rendered":"P2197 Code: O2 Sensor Signal Biased\/Stuck Lean (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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_8e320d-4f > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_8e320d-4f > .kt-inside-inner-col,.kadence-column_8e320d-4f > .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-column_8e320d-4f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_8e320d-4f > .kt-inside-inner-col{flex-direction:column;}.kadence-column_8e320d-4f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_8e320d-4f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_8e320d-4f{position:relative;}@media all and (max-width: 1024px){.kadence-column_8e320d-4f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_8e320d-4f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_8e320d-4f qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-44a359  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-ea1ee5\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_d7877f-14, .wp-block-kadence-advancedheading.kt-adv-heading_d7877f-14[data-kb-block=\"kb-adv-heading_d7877f-14\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_d7877f-14 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_d7877f-14[data-kb-block=\"kb-adv-heading_d7877f-14\"] 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-heading_d7877f-14 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_d7877f-14[data-kb-block=\"kb-adv-heading_d7877f-14\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_d7877f-14 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_d7877f-14\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P2197 code stands for &ldquo;O2 Sensor Signal Biased\/Stuck Lean (Bank 2, Sensor 1),&rdquo; which typically means the powertrain control module (PCM) detects that the air-to-fuel ratio is too lean.<\/li><li>Possible causes of the P2197 code include damaged or corroded oxygen (O2) sensor circuit wiring\/connectors, a faulty bank 2 heated O2 sensor 1, and a fuel delivery issue.<\/li><li>An illuminated check engine light, low engine power, and engine misfires are common symptoms of the P2197 code.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>A vehicle&rsquo;s engine is a powerful machine. Every component, sensor, and process needs to be precise so it can perform at its peak. If even one electrical component or sensor goes bad or malfunctions, it may have dire consequences.<\/p>\n\n\n\n<p>Take the <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen (O2) sensor\">oxygen (O2) sensor<\/a>, for example. This device monitors the oxygen levels in the exhaust as it leaves the engine. Too little oxygen in the exhaust indicates the engine is running rich. Too much oxygen in the exhaust indicates the engine is running lean and the P2197 code can register in your vehicle&rsquo;s memory.<\/p>\n\n\n\n<p>What does this code stand for and how do you know if this is the issue you&rsquo;re specifically dealing with? This short guide will give you what you need to know about this specific <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>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-1-2-1024x680.jpeg\" alt=\"oxygen sensor 1 2\" class=\"wp-image-16120\" width=\"1024\" height=\"680\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-1-2-1024x680.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-1-2-300x199.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-1-2-768x510.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-1-2-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-1-2.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The O2 sensor monitors the oxygen levels in the exhaust as it leaves the engine. <\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2197 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P2197 stands for &ldquo;O2 Sensor Signal Biased\/Stuck Lean (Bank 2, Sensor 1).&rdquo;<\/p>\n\n\n\n<p>Your vehicle&rsquo;s <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module (PCM)\">powertrain control module (PCM)<\/a>makes use of oxygen sensors to keep track of the air-to-fuel ratio. The oxygen sensor sends a voltage signal that indicates whether the fuel mixture is rich or lean to the PCM.<\/p>\n\n\n\n<p>The PCM helps keep the air and fuel levels at the <a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-good-air-fuel-ratio-chart-included\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ideal ratio of 14.7:1\">ideal ratio of 14.7:1<\/a> to keep the engine running at its optimal state. Too little oxygen means that the engine is running rich. Too much oxygen means that the engine is running lean.<\/p>\n\n\n\n<p>DTC P2197 gets set when the PCM detects that the air-to-fuel ratio is too lean. This code may also mean that the air-to-fuel ratio has gone too far from the ideal ratio of 14.7:1 that the PCM cannot correct it anymore.<\/p>\n\n\n\n<p>Also, an O2 sensor that is biased or stuck lean will always be reading below the mid-point and the ECM typically has decided it can&rsquo;t be trusted, so a code is stored.<\/p>\n\n\n\n<p>The OBD code 2197 specifically refers to the oxygen sensor between the engine and the <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a>, not the one behind it. The &ldquo;Bank 2&rdquo; in this trouble code&rsquo;s definition refers to the side of the engine that does not contain the #1 cylinder. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"941\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-module-2-1024x941.jpeg\" alt=\"engine control module 2\" class=\"wp-image-16121\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-module-2-1024x941.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-module-2-300x276.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-module-2-768x706.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-module-2-150x138.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-module-2.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption> The PCM helps keep the air and fuel levels at an ideal ratio to keep the engine running at its optimal state.  <\/figcaption><\/figure>\n\n\n\n<p><em>Note that for some vehicles like many Toyotas, this code is referring to Air\/Fuel ratio sensors or A\/F sensors. These sensors are basically more sensitive versions of O2 sensors.<\/em><\/p>\n\n\n\n<p>If you&rsquo;re planning to troubleshoot P2197 yourself, you can find more technical information in our discussion about <a href=\"https:\/\/www.carparts.com\/blog\/p0174-system-too-lean-cylinder-bank-2\/#More_About_P0174_and_Lean_Rich_Codes\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"rich\/lean codes\">rich\/lean codes<\/a>, as well as <a href=\"https:\/\/www.carparts.com\/blog\/p0172-code-fuel-system-too-rich-bank-1\/#An_In-Depth_Look_at_Air-Fuel_Mixture_and_How_It_Could_Cause_an_OBD_Code_to_Be_Stored\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"how the air\/fuel mixture can cause OBD codes\">how the air\/fuel mixture can cause OBD codes<\/a> to appear.<\/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<h2 class=\"wp-block-heading\">What are the Possible Causes of the P2197 Code?<\/h2>\n\n\n\n<p>Most OBD-II codes have several potential causes, and the P2197 code is no different. Below is a list of some of the most probable reasons the engine code P2197 registers in your vehicle&rsquo;s memory:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Damaged or corroded <a href=\"https:\/\/www.carparts.com\/oxygen-sensor-connector\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"O2 sensor circuit wiring\/connectors\">O2 sensor circuit wiring\/connectors<\/a><\/li><li>Faulty bank 2 heated O2 sensor 1<\/li><li>A fuel delivery issue (e.g., low fuel pressure)<\/li><li>Vacuum leaks<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/symptoms-of-failing-mass-air-flow-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Dirty or faulty mass airflow sensor\">Dirty or faulty mass airflow sensor<\/a><\/li><li>Exhaust leak<\/li><li>A\/F sensor relay failure<\/li><li><a href=\"https:\/\/www.carparts.com\/coolant-temperature-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ECT sensor\">ECT sensor<\/a> malfunction<\/li><li>An issue with the PCM<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P2197 Code?<\/h2>\n\n\n\n<p>There are a few warning signs that you might have an OBD code 2197 on your hands. Listed below are some symptoms that you should look out for:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Check engine light illuminates\">Check engine light illuminates<\/a><\/li><li>Low engine power<\/li><li>Engine misfires<\/li><li>Engine running rough<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2197 Code<\/h2>\n\n\n\n<p>Proper diagnosis is key to resolving any OBD-II code effectively. Because there are quite a handful of causes for the P2197 code, giving a proper diagnosis may prove challenging.<\/p>\n\n\n\n<p>Nowadays, there are a lot of resources that can help the average DIYer resolve trouble codes. Repair guides and online tutorials are just some of these resources. Below are a couple of video resources you can use to refresh your knowledge on the P2197 code.<\/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=\"Taurus Misfire Codes, P2195, P2196, P2197- Part1\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/N_1qEjNYUm4?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=\"Taurus Misfire Codes, P2195, P2196, P2197- Part2\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/9BIik9TtdII?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 P2197 Code<\/h2>\n\n\n\n<p>As mentioned above, an effective repair plan for OBD-II codes relies heavily on proper diagnosis. However, diagnosis steps and fixes will differ depending on the vehicle. It&rsquo;s important to arm yourself with accurate and reliable information before attempting any repairs.<\/p>\n\n\n\n<p>If you&rsquo;re a regular DIYer, it&rsquo;s good to invest in a good <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 any similar technical subscription in case you encounter OBD-II codes such as P2197. Although, if you don&rsquo;t have much confidence in your repair skills, you can go to your local mechanic to have the job done for you. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Notes About P2197<\/h2>\n\n\n\n<p>Typically, the P2197 code will not prevent your vehicle from running, but it will result in reduced fuel economy. If you ignore this code or leave it unsolved, it can cause serious damage to the engine and its surrounding components, such as the catalytic converter.<\/p>\n\n\n\n<p>Note that this code is similar to P2195, <a href=\"https:\/\/www.carparts.com\/blog\/p2196-code-o2-sensor-signal-biasedstuck-rich-bank-1-sensor-1\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P2196\">P2196<\/a>, and <a href=\"https:\/\/www.carparts.com\/blog\/p2198-code-o2-sensor-signal-biased-stuck-rich-bank-2-sensor-1\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P2198\">P2198<\/a>. If multiple DTC codes appear along with the P2197, it&rsquo;s recommended to fix them in the order they appear.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n    <!-- start of editable content -->\n\n    <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" aria-label=\"oxygen sensor\" rel=\"noopener\">\n        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_210,w_210,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/reph960923_1\" alt=\"oxygen sensor\">\n\t<strong>Oxygen Sensor<\/strong>\n    <\/a>\n\n    <a href=\"https:\/\/www.carparts.com\/catalytic%20converter\" target=\"_blank\" aria-label=\"catalytic converter\" rel=\"noopener\">\n        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_210,w_210,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repf960330_1\" alt=\"catalytic converter\">\n\t<strong>Catalytic Converter<\/strong>\n    <\/a>\n\n    <!-- end of editable content -->\n\n<\/div>\n<\/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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>A vehicle&rsquo;s engine is a powerful machine. Every component, sensor, and process needs to be precise so it can perform&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2197-code-o2-sensor-signal-biased-stuck-lean-bank-2-sensor-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":16119,"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-16116","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 v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P2197 Code: O2 Sensor Signal Biased\/Stuck Lean (Bank 2, Sensor 1) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Got the code P2197 on your scanner? Learn about its definition, causes, and symptoms in this article. Plus find out what to do to fix the issue.\" \/>\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\/p2197-code-o2-sensor-signal-biased-stuck-lean-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=\"P2197 Code: O2 Sensor Signal Biased\/Stuck Lean (Bank 2, Sensor 1) - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Got the code P2197 on your scanner? Learn about its definition, causes, and symptoms in this article. 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