{"id":71660,"date":"2022-09-01T02:47:33","date_gmt":"2022-09-01T09:47:33","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=71660"},"modified":"2023-09-04T23:17:41","modified_gmt":"2023-09-05T06:17:41","slug":"p2251-code-o2-sensor-negative-current-control-circuit-open-bank-1-sensor-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2251-code-o2-sensor-negative-current-control-circuit-open-bank-1-sensor-1\/","title":{"rendered":"P2251 Code: O2 Sensor Negative Current Control Circuit \/ Open Bank 1 Sensor 1"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_843234-c1 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_843234-c1 > .kt-inside-inner-col,.kadence-column_843234-c1 > .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_843234-c1 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_843234-c1 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_843234-c1 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_843234-c1 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_843234-c1{position:relative;}@media all and (max-width: 1024px){.kadence-column_843234-c1 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_843234-c1 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_843234-c1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-14afdf  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-d76deb\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_5ca76d-7b, .wp-block-kadence-advancedheading.kt-adv-heading_5ca76d-7b[data-kb-block=\"kb-adv-heading_5ca76d-7b\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_5ca76d-7b mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_5ca76d-7b[data-kb-block=\"kb-adv-heading_5ca76d-7b\"] 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_5ca76d-7b img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_5ca76d-7b[data-kb-block=\"kb-adv-heading_5ca76d-7b\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_5ca76d-7b summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_5ca76d-7b\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The diagnostic trouble code (DTC) P2251 indicates &ldquo;O2 Sensor Negative Current Control Circuit \/ Open Bank 1 Sensor 1.&rdquo;<\/li><li>Your vehicle&rsquo;s powertrain control module (PCM) will set this code if it detects a negative current error in the upstream oxygen sensor for engine bank 1.<\/li><li>Common causes of the P2251 code are an exhaust leak, a bad oxygen sensor, a faulty PCM, and oxygen sensor wiring problems.<\/li><li>A vehicle that sets a P2251 code can show symptoms like check engine light illumination, engine performance problems, and higher fuel consumption.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensor\">oxygen sensor<\/a> measures the amount of oxygen in the exhaust gasses released by the engine after combustion. It sends its readings to the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> (PCM), which uses the information to adjust various processes.<\/p>\n\n\n\n<p>If the oxygen sensor fails or stops sending its signals, the PCM might log a P2251 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2251 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) P2251 stands for &ldquo;Oxygen Sensor Negative Current Control Circuit\/Open Bank 1 Sensor 1.&rdquo;<\/p>\n\n\n\n<p>The PCM files this code when it detects a negative current error in the upstream oxygen sensor for engine bank one. The upstream sensor is located before the <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a>, while the engine bank one contains the number one cylinder.<\/p>\n\n\n\n<p>Heated oxygen sensors are located at strategic points in the exhaust system. They have a heating element that runs on battery voltage. When the engine is cold, the heater raises the temperature of its sensor until the device can start measuring the oxygen content in the exhaust gasses.<\/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\/2022\/08\/drivewire-car-upstream-oxygen-sensor-1024x602.jpg\" alt=\"drivewire car upstream oxygen sensor\" class=\"wp-image-71680\" width=\"1024\" height=\"602\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/drivewire-car-upstream-oxygen-sensor-1024x602.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/drivewire-car-upstream-oxygen-sensor-300x176.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/drivewire-car-upstream-oxygen-sensor-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/drivewire-car-upstream-oxygen-sensor-1536x904.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/drivewire-car-upstream-oxygen-sensor-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/drivewire-car-upstream-oxygen-sensor.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The oxygen sensor measures the amount of oxygen in the exhaust gasses released by the engine after combustion.<\/figcaption><\/figure>\n\n\n\n<p>These oxygen sensors send voltage signal outputs to the PCM. A high voltage indicates that there&rsquo;s more oxygen in the exhaust, while a low voltage represents the opposite. These signals use less than one volt.<\/p>\n\n\n\n<p>If the signal&rsquo;s output does not fit within the expected range, the computer will log a P2251 code.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code P2251 can differ according to the vehicle manufacturer. Check 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 Common Causes of the P2251 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Exhaust leak<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/bad-o2-sensor-symptoms-causes-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Bad oxygen sensor\">Bad oxygen sensor<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty PCM\">Faulty PCM<\/a><\/li><li>Oxygen sensor wiring problems<\/li><\/ul>\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 Common Symptoms of the P2251 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><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><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><li>Higher fuel consumption<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2251 Code<\/h2>\n\n\n\n<p>The P2251 code is a generic diagnostic code that various makes and models can log. However, this does not mean that there is a one-size-fits-all solution to determine the problem that&rsquo;s causing it.<\/p>\n\n\n\n<p>If you&rsquo;re not confident about conducting diagnostic tests on your vehicle, it&rsquo;s best to leave the job to a certified mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here is a video that can give you an idea of what the process might involve:<\/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=\"Doing this will make your car stall out and die at stop. Never do this. P2251 P113D P0032 P0032\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/_9_Dl-wVUWc?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 P2251 Code<\/h2>\n\n\n\n<p>Attempting to fix a P2251 code can be difficult if you don&rsquo;t have the right tools and know-how. When in doubt, take your vehicle to an auto repair shop and let the pros resolve the issue.<\/p>\n\n\n\n<p>But if you&rsquo;re an experienced automotive DIYer and you have the tools to get the job done, you can go ahead and address the P2251 code on your own. Make sure you consult a vehicle-specific <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or an online repair database\">repair manual or an online repair database<\/a> before you get started.<\/p>\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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The oxygen sensor measures the amount of oxygen in the exhaust gasses released by the engine after combustion. It sends&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2251-code-o2-sensor-negative-current-control-circuit-open-bank-1-sensor-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":71678,"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":[1189,1323,1190],"ppma_author":[2607,2855],"class_list":{"0":"post-71660","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-catalytic-converter-2","9":"tag-engine-control-module-2","10":"tag-oxygen-sensor-2","11":"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>P2251 Code: O2 Sensor Negative Current Control Circuit \/ Open Bank 1 Sensor 1 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what the P2251 code means, its possible causes, and the common symptoms associated with it. Plus learn the best way to approach 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\/p2251-code-o2-sensor-negative-current-control-circuit-open-bank-1-sensor-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2251 Code: O2 Sensor Negative Current Control Circuit \/ Open Bank 1 Sensor 1 - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what the P2251 code means, its possible causes, and the common symptoms associated with it. Plus learn the best way to approach the issue.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p2251-code-o2-sensor-negative-current-control-circuit-open-bank-1-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:published_time\" content=\"2022-09-01T09:47:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-05T06:17:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/An-Upstream-Oxygen-Sensor-installed-on-car.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1333\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2251-code-o2-sensor-negative-current-control-circuit-open-bank-1-sensor-1\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2251-code-o2-sensor-negative-current-control-circuit-open-bank-1-sensor-1\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"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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