{"id":77406,"date":"2022-11-04T02:57:10","date_gmt":"2022-11-04T09:57:10","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=77406"},"modified":"2023-10-02T20:57:53","modified_gmt":"2023-10-03T03:57:53","slug":"p2001-code-nox-absorber-efficiency-below-threshold-bank-2","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2001-code-nox-absorber-efficiency-below-threshold-bank-2\/","title":{"rendered":"P2001 Code: NOx Adsorber Efficiency Below Threshold Bank 2"},"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_6b95df-01 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_6b95df-01 > .kt-inside-inner-col,.kadence-column_6b95df-01 > .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_6b95df-01 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_6b95df-01 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_6b95df-01 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_6b95df-01 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_6b95df-01{position:relative;}@media all and (max-width: 1024px){.kadence-column_6b95df-01 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_6b95df-01 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_6b95df-01 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-1e0689  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-1a49c1\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_285ebd-39, .wp-block-kadence-advancedheading.kt-adv-heading_285ebd-39[data-kb-block=\"kb-adv-heading_285ebd-39\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_285ebd-39 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_285ebd-39[data-kb-block=\"kb-adv-heading_285ebd-39\"] 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_285ebd-39 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_285ebd-39[data-kb-block=\"kb-adv-heading_285ebd-39\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_285ebd-39 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_285ebd-39\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P2001 code stands for &ldquo;NOx Adsorber Efficiency Below Threshold Bank 2,&rdquo; which means the powertrain control module detects that the Selective Catalytic Reduction (SCR) system isn&rsquo;t performing its job properly.<\/li><li>A faulty oxygen sensor or NOx sensor, an overloaded NOx adsorber catalyst, and a faulty mass air flow sensor are some common causes of the P2001 code.<\/li><li>An illuminated check engine light is one of the common symptoms of the P2001 code.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Diesel-powered engines are equipped with a Selective Catalytic Reduction (SCR) system that uses Diesel Exhaust Fluid (DEF) to reduce nitrogen oxide (NOx) emissions. When there are problems with the SCR system, it can trigger the P2001 code or other related <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"trouble codes\">trouble codes<\/a>. You should use a scan tool to check if your vehicle has stored these codes, as they can help you diagnose the issue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2001 Code Mean?<\/h2>\n\n\n\n<p>The P2001 code is defined as NOx Adsorber Efficiency Below Threshold Bank 2. The powertrain control module triggers the P2001 code when it detects that the SCR system isn&rsquo;t performing its job properly. This code can be triggered when your vehicle&rsquo;s nitrogen oxide (NOx) sensors detect higher levels of NOx in the exhaust. This code indicates that this problem is present in engine bank #2.<\/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\/11\/car-nitrogen-oxide-sensor-1024x683.jpg\" alt=\"car nitrogen oxide sensor image\" class=\"wp-image-77457\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-nitrogen-oxide-sensor-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-nitrogen-oxide-sensor-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-nitrogen-oxide-sensor-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-nitrogen-oxide-sensor-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-nitrogen-oxide-sensor-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-nitrogen-oxide-sensor-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-nitrogen-oxide-sensor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The P2001 code can be triggered when your vehicle&rsquo;s nitrogen oxide (NOx) sensors detect higher levels of NOx in the exhaust.<\/figcaption><\/figure>\n\n\n\n<p><em><strong>Note<\/strong>: The definition of the P2001 code can 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 Common Causes of the P2001 Code?<\/h2>\n\n\n\n<p>The P2001 code is typically triggered when your vehicle has the following problems:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/bad-o2-sensor-symptoms-causes-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty oxygen sensor\">Faulty oxygen sensor<\/a> or NOx sensor<\/li><li>Bad or overloaded NOx adsorber catalyst<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/symptoms-of-failing-mass-air-flow-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty mass air flow sensor\">Faulty mass air flow sensor<\/a><\/li><li>Exhaust or intake leaks<\/li><li>Circuit issues, such as a damaged <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wire\">wire<\/a> or poor connection<\/li><li>A PCM issue, such as software in need of an update<\/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 P2001 Code?<\/h2>\n\n\n\n<p>Common symptoms associated with code P2001 include the following:<\/p>\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><\/ul>\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\/11\/removing-maf-sensor-1024x683.jpg\" alt=\"mechanic removing a maf sensor\" class=\"wp-image-77470\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/removing-maf-sensor-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/removing-maf-sensor-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/removing-maf-sensor-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/removing-maf-sensor-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/removing-maf-sensor-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/removing-maf-sensor-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/removing-maf-sensor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>An issue with the MAF sensor can also result in a P2001 code.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2001 code<\/h2>\n\n\n\n<p>If the P2001 code has been triggered, then you need to identify the cause of the diagnostic trouble code (DTC) before you make any repairs. You shouldn&rsquo;t automatically assume that your vehicle has the same problems as the common causes of the P2001 code.<\/p>\n\n\n\n<p>Diagnosing DTCs typically involves doing visual inspections and perhaps even tests on some components. This task can require technical knowledge and specialized tools. If you think this is daunting, then you should leave it to a professional mechanic.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P2001 Code<\/h2>\n\n\n\n<p>Want to solve the problems triggering the P2001 code? Unfortunately, there isn&rsquo;t a single procedure that will guarantee a fix. There&rsquo;s a chance that your vehicle might not experience any reliability or drivability symptoms with this trouble code. However, this shouldn&rsquo;t stop you from fixing this DTC, especially considering that your vehicle will produce more emissions and pollution when this problem persists. We recommended that you fix the issues triggering this code to prevent any future problems.<\/p>\n\n\n\n<p>Your course of action will depend on the diagnosis. That&rsquo;s why getting an accurate diagnosis is important. Once you&rsquo;ve found the root cause, you can start looking at reputable <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=\"internet repair resources and how-to guides\">internet repair resources and how-to guides<\/a> for possible solutions. Also, make sure to <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check your owner&rsquo;s manual\">check your owner&rsquo;s manual<\/a> because it might have important information regarding your problem.<\/p>\n\n\n\n<p>If you don&rsquo;t have much experience diagnosing or fixing error codes, then you should consult a professional mechanic.<\/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>Diesel-powered engines are equipped with a Selective Catalytic Reduction (SCR) system that uses Diesel Exhaust Fluid (DEF) to reduce nitrogen&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2001-code-nox-absorber-efficiency-below-threshold-bank-2\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":77454,"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":[3157],"ppma_author":[2607,2855],"class_list":{"0":"post-77406","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-nitrogen-oxide-sensor","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>P2001 Code: NOx Adsorber Efficiency Below Threshold Bank 2 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Know more about the P2001 diagnostic trouble code\u2019s definition, common causes, and symptoms in this article.\" \/>\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\/p2001-code-nox-absorber-efficiency-below-threshold-bank-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2001 Code: NOx Adsorber Efficiency Below Threshold Bank 2 - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Know more about the P2001 diagnostic trouble code\u2019s definition, common causes, and symptoms in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p2001-code-nox-absorber-efficiency-below-threshold-bank-2\/\" \/>\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=\"2022-11-04T09:57:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-03T03:57:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/diagnostic-scan-tool-for-car.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\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=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2001-code-nox-absorber-efficiency-below-threshold-bank-2\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2001-code-nox-absorber-efficiency-below-threshold-bank-2\\\/\"},\"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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