{"id":85720,"date":"2023-06-21T21:33:37","date_gmt":"2023-06-22T04:33:37","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=85720"},"modified":"2025-02-25T17:45:36","modified_gmt":"2025-02-26T01:45:36","slug":"p1128-code-closed-loop-fuel-not-achieved-bank-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p1128-code-closed-loop-fuel-not-achieved-bank-1\/","title":{"rendered":"P1128 Code: Closed Loop Fuel Not Achieved Bank 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-column85720_75ed71-31 > .kt-inside-inner-col,.kadence-column85720_75ed71-31 > .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-column85720_75ed71-31 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column85720_75ed71-31 > .kt-inside-inner-col{flex-direction:column;}.kadence-column85720_75ed71-31 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column85720_75ed71-31 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column85720_75ed71-31{position:relative;}@media all and (max-width: 1024px){.kadence-column85720_75ed71-31 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column85720_75ed71-31 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column85720_75ed71-31 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-101707  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-c3b74b\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading85720_9bc075-d5, .wp-block-kadence-advancedheading.kt-adv-heading85720_9bc075-d5[data-kb-block=\"kb-adv-heading85720_9bc075-d5\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading85720_9bc075-d5 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading85720_9bc075-d5[data-kb-block=\"kb-adv-heading85720_9bc075-d5\"] 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-heading85720_9bc075-d5 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading85720_9bc075-d5[data-kb-block=\"kb-adv-heading85720_9bc075-d5\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading85720_9bc075-d5 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading85720_9bc075-d5\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Diagnostic trouble code (DTC) P1128 stands for &ldquo;Closed Loop Fuel Not Achieved Bank 1.&rdquo; The powertrain control module (PCM) logs this code when it detects an issue in the fuel system, causing it to stay in open-loop operation.<\/li>\n\n\n\n<li>The P1128 code can be caused by a wide range of issues, including a clogged fuel pump strainer, a bad upstream oxygen sensor, wiring issues, a faulty manifold absolute pressure (MAP) or mass air flow (MAF) sensor, and intake air temperature issues, among other problems.<\/li>\n\n\n\n<li>Vehicles with a P1128 code can have decreased fuel efficiency, poor engine performance, rough idling, misfires, failed emissions tests, and an illuminated check engine light.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Your ride&rsquo;s fuel system delivers fuel to the engine as needed. It has critical components like the <a href=\"https:\/\/www.carparts.com\/fuel-pump\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel pump\">fuel pump<\/a>, <a href=\"https:\/\/www.carparts.com\/fuel-tank\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel tank\">fuel tank<\/a>, <a href=\"https:\/\/www.carparts.com\/fuel-filter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel filter\">fuel filter<\/a>, and <a href=\"https:\/\/www.carparts.com\/fuel-injector\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"injectors\">injectors<\/a>. If a problem develops in the fuel management system, your vehicle might log a P1128 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P1128 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) P1128 stands for &ldquo;Closed Loop Fuel Not Achieved Bank 1.&rdquo;<\/p>\n\n\n\n<p>This code is logged when 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) detects an issue in the fuel system that&rsquo;s causing it to stay in open-loop operation within the timeframe set by your manufacturer.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"681\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/heated-oxygen-sensor-of-car-malfunctioning-1024x681.jpg\" alt=\"heated oxygen sensor of car malfunctioning\" class=\"wp-image-85722\" style=\"width:1024px;height:681px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/heated-oxygen-sensor-of-car-malfunctioning-1024x681.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/heated-oxygen-sensor-of-car-malfunctioning-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/heated-oxygen-sensor-of-car-malfunctioning-768x511.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/heated-oxygen-sensor-of-car-malfunctioning-1536x1021.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/heated-oxygen-sensor-of-car-malfunctioning-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/heated-oxygen-sensor-of-car-malfunctioning-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/heated-oxygen-sensor-of-car-malfunctioning-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">A P1128 code can also indicate that the heated oxygen (O2) sensors in your engine are malfunctioning.<\/figcaption><\/figure>\n\n\n\n<p>Code P1128 can point to an issue with the sensor, the wiring or the PCM. In some cases, other factors affecting the air-fuel mixture can cause the entire system to remain in open loop but there will typically be noticeable symptoms in a case like this.<\/p>\n\n\n\n<p>&ldquo;Bank 1&rdquo; means that the issue is in the first bank of cylinders in a V-type engine. A P1128 code can also indicate that the heated <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen (O2) sensors\">oxygen (O2) sensors<\/a> in your engine are malfunctioning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A Quick Note About Closed Loop and Open Loop Control<\/h3>\n\n\n\n<p>Closed loop fuel control is achieved very soon after the engine starts due to oxygen sensor heaters bringing the sensors online as quickly as possible. But wide open throttle (WOT) is an open loop mode by default due to the engine&rsquo;s need for maximum fuel delivery at that point.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"416\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/open-and-closed-loop-control-diagram-1024x416.jpg\" alt=\"diagram of an open and closed loop fuel control \" class=\"wp-image-87741\" style=\"width:1024px;height:416px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/open-and-closed-loop-control-diagram-1024x416.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/open-and-closed-loop-control-diagram-300x122.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/open-and-closed-loop-control-diagram-768x312.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/open-and-closed-loop-control-diagram-150x61.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/open-and-closed-loop-control-diagram.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">A diagram illustrating the difference between open loop fuel control and closed loop fuel control | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Closed loop fuel control is achieved very soon after the engine starts due to oxygen sensor heaters bringing the sensors online as quickly as possible. But wide open throttle (WOT) is an open loop mode by default due to the engine&rsquo;s need for maximum fuel delivery at that point.<\/p>\n<cite>&ndash;<a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P1128 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<h2 class=\"wp-block-heading\">What Are the Common Causes of the P1128 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clogged fuel pump internal strainer<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/bad-o2-sensor-symptoms-causes-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Defective upstream O2 sensor\">Defective upstream O2 sensor<\/a><\/li>\n\n\n\n<li>Contaminated O2 sensor element<\/li>\n\n\n\n<li>Abnormally high or low fuel pressure<\/li>\n\n\n\n<li>Problems with wirings<\/li>\n\n\n\n<li>Bad <a href=\"https:\/\/www.carparts.com\/blog\/is-it-safe-to-drive-with-a-bad-map-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"MAP\">MAP<\/a> or <a href=\"https:\/\/www.carparts.com\/blog\/symptoms-of-failing-mass-air-flow-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"MAF sensors\">MAF sensors<\/a><\/li>\n\n\n\n<li>Malfunctioning <a href=\"https:\/\/www.carparts.com\/blog\/engine-coolant-temperature-sensor-purpose-location-and-failure-signs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine coolant temperature sensor\">engine coolant temperature sensor<\/a><\/li>\n\n\n\n<li>Excessive oil consumption<\/li>\n\n\n\n<li>Intake air temperature sensor issues<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Malfunctioning PCM\">Malfunctioning PCM<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Symptoms of the P1128 Code?<\/h2>\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>Decreased fuel efficiency<\/li>\n\n\n\n<li>Poor engine performance<\/li>\n\n\n\n<li>Rough idling<\/li>\n\n\n\n<li>Engine misfire<\/li>\n\n\n\n<li>Failed emission test<\/li>\n<\/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\">How to Diagnose the P1128 Code<\/h2>\n\n\n\n<p>The P1128 is a manufacturer-specific code, so there&rsquo;s no universal diagnostic procedure that would work for all vehicles. After all, vehicles can be structured differently depending on their manufacturer.<\/p>\n\n\n\n<p>If you&rsquo;re not sure how to diagnose the issue, it&rsquo;s best to take your vehicle to an auto repair shop for a proper diagnosis. Otherwise, you can do it yourself.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P1128 Code<\/h2>\n\n\n\n<p>Resolving a P1128 isn&rsquo;t easy, especially if you don&rsquo;t have in-depth knowledge of the fuel management system. Your best option is to let a licensed mechanic fix the problem for you.<\/p>\n\n\n\n<p>But if you&rsquo;re confident that you can resolve the trouble code on your own, make sure to read up about this trouble code before you do anything with your vehicle. Resources like Chilton can give you vehicle-specific information that can help you fix code P1128.<\/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>Your ride&rsquo;s fuel system delivers fuel to the engine as needed. It has critical components like the fuel pump, fuel&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p1128-code-closed-loop-fuel-not-achieved-bank-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":85742,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"_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":[1199,1185,1197,1198,1190],"ppma_author":[2607,2985],"class_list":{"0":"post-85720","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-fuel-filter-2","9":"tag-fuel-injector-2","10":"tag-fuel-pump-2","11":"tag-fuel-tank-2","12":"tag-oxygen-sensor-2","13":"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>P1128 Code: Closed Loop Fuel Not Achieved Bank 1 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Did your scan tool read a P1128 code? Find out what it means plus its common causes and symptoms through 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\/p1128-code-closed-loop-fuel-not-achieved-bank-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P1128 Code: Closed Loop Fuel Not Achieved Bank 1 - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Did your scan tool read a P1128 code? Find out what it means plus its common causes and symptoms through this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p1128-code-closed-loop-fuel-not-achieved-bank-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=\"2023-06-22T04:33:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-02-26T01:45:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-diagnostic-detects-p1128-code-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1366\" \/>\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\\\/p1128-code-closed-loop-fuel-not-achieved-bank-1\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p1128-code-closed-loop-fuel-not-achieved-bank-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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