{"id":76520,"date":"2022-10-25T20:35:13","date_gmt":"2022-10-26T03:35:13","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=76520"},"modified":"2023-09-29T21:02:04","modified_gmt":"2023-09-30T04:02:04","slug":"p2179-code-system-too-lean-off-idle-bank-2","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2179-code-system-too-lean-off-idle-bank-2\/","title":{"rendered":"P2179 Code: System Too Lean Off Idle 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_d92dc5-1c > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_d92dc5-1c > .kt-inside-inner-col,.kadence-column_d92dc5-1c > .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_d92dc5-1c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_d92dc5-1c > .kt-inside-inner-col{flex-direction:column;}.kadence-column_d92dc5-1c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_d92dc5-1c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_d92dc5-1c{position:relative;}@media all and (max-width: 1024px){.kadence-column_d92dc5-1c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_d92dc5-1c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_d92dc5-1c qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-8fa11a  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-6d6382\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_2e4a3e-ba, .wp-block-kadence-advancedheading.kt-adv-heading_2e4a3e-ba[data-kb-block=\"kb-adv-heading_2e4a3e-ba\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_2e4a3e-ba mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_2e4a3e-ba[data-kb-block=\"kb-adv-heading_2e4a3e-ba\"] 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_2e4a3e-ba img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_2e4a3e-ba[data-kb-block=\"kb-adv-heading_2e4a3e-ba\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_2e4a3e-ba summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_2e4a3e-ba\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The diagnostic trouble code (DTC) P2179 indicates &ldquo;System Too Lean Off Idle Bank 2.&rdquo;<\/li><li>The powertrain control module (PCM) will log the P2179 code if it detects a lean condition in bank 2 while the engine is idling.<\/li><li>Common causes of the P2179 code are exhaust leaks, fuel delivery issues, and bad air\/fuel ratio sensor or oxygen sensor.<\/li><li>A vehicle that sets the P2179 code can show symptoms like the check engine light switching on, insufficient engine power, and misfires.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The powertrain control module (PCM) controls the flow of fuel into the engine. It relies on several sensors to determine the most efficient amount to burn for power generation. One of these sensors is the air\/fuel ratio sensor, which measures the oxygen level in the exhaust gases produced by the combustion process in the engine.<\/p>\n\n\n\n<p>If the readings from the air\/fuel ratio sensor shows that the <a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-good-air-fuel-ratio-chart-included\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel-air mixture\">fuel-air mixture<\/a> is too lean during idle, the PCM will log a P2179 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2179 Code Mean?<\/h2>\n\n\n\n<p>The diagnostic trouble code (DTC) P2179 indicates &ldquo;System Too Lean Off Idle Bank 2.&rdquo; It applies to the bank of cylinders on the side of the engine without cylinder 1.<\/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\/10\/air-fuel-ratio-sensor-1024x683.jpg\" alt=\"image of an air fuel ratio sensor\" class=\"wp-image-76798\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/air-fuel-ratio-sensor-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/air-fuel-ratio-sensor-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/air-fuel-ratio-sensor-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/air-fuel-ratio-sensor-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/air-fuel-ratio-sensor-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/air-fuel-ratio-sensor-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/air-fuel-ratio-sensor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>If the readings from the air\/fuel ratio sensor shows that the fuel-air mixture is too lean during idle, the PCM will log a P2179 code.<\/figcaption><\/figure>\n\n\n\n<p>The air\/fuel ratio sensor is actually an <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensor\">oxygen sensor<\/a> that&rsquo;s pulling double duty. Its readings guide the PCM when the controller adjusts various processes to achieve the most efficient engine operation.<\/p>\n\n\n\n<p>A lean condition indicates the air-fuel ratio has too much air. When an engine runs lean, its performance suffers and its parts can develop serious problems. The PCM will try to correct the lean condition by either reducing the air intake, increasing the amount of fuel injected into the cylinders, or both.<\/p>\n\n\n\n<p>The PCM regularly compares the amount of air and fuel that enter the engine. If the controller keeps seeing a lean condition in the bank 2 while the engine is idling, it will set the generic code P2179.<\/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><em><strong>Note:<\/strong> The definition of code P2179 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 P2179 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Exhaust leak<\/li><li>Fuel delivery issues<\/li><li>Intake air leak<\/li><li>Bad air\/fuel ratio sensor or <a href=\"https:\/\/www.carparts.com\/blog\/bad-o2-sensor-symptoms-causes-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensor\">oxygen sensor<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/symptoms-of-failing-mass-air-flow-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Bad mass airflow sensor\">Bad mass airflow sensor<\/a><\/li><li>Internal engine problem<\/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>Bad PCM or software in need of an update<\/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\/10\/fuel-system-hose-1024x712.jpg\" alt=\"checking a car fuel system hose\" class=\"wp-image-76801\" width=\"1024\" height=\"712\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-system-hose-1024x712.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-system-hose-300x209.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-system-hose-768x534.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-system-hose-150x104.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-system-hose.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Exhaust or intake leaks can trigger the code P2179.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P2179 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=\"Check engine light switches on\">Check engine light switches on<\/a><\/li><li>Insufficient engine power<\/li><li><a href=\"http:\/\/www.carparts.com\/blog\/cylinder-misfire-causes-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Engine misfire\">Engine misfire<\/a><\/li><li>Bad fuel economy<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2179 Code<\/h2>\n\n\n\n<p>The P2179 code is a generic code that applies to various OBD-II-compliant vehicles. While it can show up in many makes and models, the cause and symptoms can vary between individual cases. Because of this, there is no single process to diagnose and fix the <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"code\">code<\/a>.<\/p>\n\n\n\n<p>If you&rsquo;re not confident about conducting diagnostic tests on your vehicle, it&rsquo;s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P2179 Code<\/h2>\n\n\n\n<p>Attempting to fix a P2179 code can become a challenging task if you don&rsquo;t have the right tools and know-how to test your vehicle. In most cases, it&rsquo;s best to leave the job to professionals.<\/p>\n\n\n\n<p>For DIYers with advanced technical knowledge and hands-on experience who prefer to test and replace their vehicle&rsquo;s faulty parts on their own, it will be helpful to rely on the appropriate <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 refer to an online repair database\">repair manual or refer to an online repair database<\/a>.<\/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 powertrain control module (PCM) controls the flow of fuel into the engine. It relies on several sensors to determine&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2179-code-system-too-lean-off-idle-bank-2\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":76780,"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":[2607,2855],"class_list":{"0":"post-76520","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>P2179 Code: System Too Lean Off Idle Bank 2 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what a P2179 code means, its possible causes, and the common symptoms associated with this code. 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