{"id":64444,"date":"2021-12-20T00:44:07","date_gmt":"2021-12-20T08:44:07","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=64444"},"modified":"2024-08-19T23:51:39","modified_gmt":"2024-08-20T06:51:39","slug":"p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/","title":{"rendered":"P2099 Code: Post Catalyst Fuel Trim System Too Rich (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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column64444_86e93a-3c > .kt-inside-inner-col,.kadence-column64444_86e93a-3c > .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-column64444_86e93a-3c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column64444_86e93a-3c > .kt-inside-inner-col{flex-direction:column;}.kadence-column64444_86e93a-3c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column64444_86e93a-3c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column64444_86e93a-3c{position:relative;}@media all and (max-width: 1024px){.kadence-column64444_86e93a-3c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column64444_86e93a-3c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column64444_86e93a-3c inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-29c864  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-f46915\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading64444_67674c-be, .wp-block-kadence-advancedheading.kt-adv-heading64444_67674c-be[data-kb-block=\"kb-adv-heading64444_67674c-be\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading64444_67674c-be mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading64444_67674c-be[data-kb-block=\"kb-adv-heading64444_67674c-be\"] 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-heading64444_67674c-be img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading64444_67674c-be[data-kb-block=\"kb-adv-heading64444_67674c-be\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading64444_67674c-be summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading64444_67674c-be\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The P2099 code stands for &ldquo;Post Catalyst Fuel Trim System Too Rich (Bank 2).&rdquo;<\/li>\n\n\n\n<li>It triggers when the powertrain control module (PCM) detects a biased signal voltage input from the downstream oxygen sensor that indicates an issue with the air and fuel mixture.<\/li>\n\n\n\n<li>Some common triggers for the code include faulty sensors, circuit issues, and exhaust leaks.<\/li>\n\n\n\n<li>One of the most common symptoms of the code is excessive fuel consumption.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Code P2099 is one of many trouble codes that may be logged and retrieved from the OBD system. Here is some basic information that may help you understand what this code may mean for your vehicle.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2099 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) P2099 stands for &ldquo;Post Catalyst Fuel Trim System Too Rich (Bank 2).&rdquo; This code may be logged when the powertrain control module (PCM) detects a biased signal voltage input from the downstream oxygen sensor for engine bank 1 that indicates a problem with the air-fuel mixture.&nbsp;<\/p>\n\n\n<style>.kadence-column64444_0b1b69-3a > .kt-inside-inner-col,.kadence-column64444_0b1b69-3a > .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-column64444_0b1b69-3a > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column64444_0b1b69-3a > .kt-inside-inner-col{flex-direction:column;}.kadence-column64444_0b1b69-3a > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column64444_0b1b69-3a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column64444_0b1b69-3a{position:relative;}@media all and (max-width: 1024px){.kadence-column64444_0b1b69-3a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column64444_0b1b69-3a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column64444_0b1b69-3a kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id64444_e3037c-2a > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id64444_e3037c-2a > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id64444_e3037c-2a > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id64444_e3037c-2a > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id64444_e3037c-2a .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id64444_e3037c-2a .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id64444_e3037c-2a .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id64444_e3037c-2a .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id64444_e3037c-2a .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id64444_e3037c-2a .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id64444_e3037c-2a > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id64444_e3037c-2a .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id64444_e3037c-2a .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id64444_e3037c-2a > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id64444_e3037c-2a .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id64444_e3037c-2a .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id64444_e3037c-2a alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col{display:flex;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col{min-height:45px;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col,.kadence-column64444_6dd1e7-f6 > .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-column64444_6dd1e7-f6 > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > *, .kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column64444_6dd1e7-f6{position:relative;}@media all and (max-width: 1024px){.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > *, .kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > *, .kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column64444_6dd1e7-f6 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column64444_6dd1e7-f6 kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image64444_c4e4f3-de.kb-image-is-ratio-size, .kb-image64444_c4e4f3-de .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image64444_c4e4f3-de.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image64444_c4e4f3-de .kb-image-is-ratio-size{align-self:unset;}.kb-image64444_c4e4f3-de figure{max-width:45px;}.kb-image64444_c4e4f3-de .image-is-svg, .kb-image64444_c4e4f3-de .image-is-svg img{width:100%;}.kb-image64444_c4e4f3-de .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image64444_c4e4f3-de\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column64444_1c3588-32 > .kt-inside-inner-col,.kadence-column64444_1c3588-32 > .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-column64444_1c3588-32 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column64444_1c3588-32 > .kt-inside-inner-col{flex-direction:column;}.kadence-column64444_1c3588-32 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column64444_1c3588-32 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column64444_1c3588-32{position:relative;}@media all and (max-width: 1024px){.kadence-column64444_1c3588-32 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column64444_1c3588-32 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column64444_1c3588-32 inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\nCode P2099 points to a problem with the downstream O2 sensor, which is already supposed to be lazier than the upstream sensor on a system where the catalyst is storing oxygen correctly. But if the HO2S 2\/2 (downstream) sensor reacts in an unexpected way when compared to the upstream O2 sensor, this code will be stored.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p0131-o2-sensor-circuit-low-voltage-bank-1-sensor-1\/\" target=\"_self\" rel=\"dofollow\" class=\"u00b0c38ec00a8aa28b35780407dae277\"><style> .u00b0c38ec00a8aa28b35780407dae277 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .u00b0c38ec00a8aa28b35780407dae277:active, .u00b0c38ec00a8aa28b35780407dae277:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u00b0c38ec00a8aa28b35780407dae277 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u00b0c38ec00a8aa28b35780407dae277 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u00b0c38ec00a8aa28b35780407dae277 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u00b0c38ec00a8aa28b35780407dae277:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P0131: O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> recognizes changes in voltage as variations in exhaust oxygen concentration. These variations reflect whether the engine is running lean or rich. The voltage signal output from the oxygen sensor is lower when more oxygen is present in the exhaust. On the other hand, the voltage signal output is higher when less oxygen is present in the exhaust.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"602\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/Car-Part-Oxygen-Sensor-Downstream-1024x602.jpg\" alt=\"Car Part Oxygen Sensor Downstream\" class=\"wp-image-64445\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/Car-Part-Oxygen-Sensor-Downstream-1024x602.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/Car-Part-Oxygen-Sensor-Downstream-300x176.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/Car-Part-Oxygen-Sensor-Downstream-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/Car-Part-Oxygen-Sensor-Downstream-1536x904.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/Car-Part-Oxygen-Sensor-Downstream-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/Car-Part-Oxygen-Sensor-Downstream.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The P2099 code gets logged when the powertrain control module (PCM) detects a biased signal voltage input from the downstream oxygen sensor for engine bank 1, which indicates a problem with the air-fuel mixture.&nbsp; <\/figcaption><\/figure>\n\n\n\n<p>This information is used by the PCM to calculate fuel delivery and ignition timing. Once the PCM enters closed loop operation, if the bank 2 downstream oxygen sensor circuit detects an air-fuel mixture that can no longer be corrected, code P2099 will be stored.<\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p0037-code-heated-oxygen-sensor-heater-control-circuit-low-bank-1-sensor-2\/\" target=\"_self\" rel=\"dofollow\" class=\"udc7da4848f4f3204e53e9bddc0980543\"><style> .udc7da4848f4f3204e53e9bddc0980543 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .udc7da4848f4f3204e53e9bddc0980543:active, .udc7da4848f4f3204e53e9bddc0980543:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .udc7da4848f4f3204e53e9bddc0980543 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .udc7da4848f4f3204e53e9bddc0980543 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .udc7da4848f4f3204e53e9bddc0980543 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .udc7da4848f4f3204e53e9bddc0980543:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P0037 Code: Heated Oxygen Sensor Heater Control Circuit Low (Bank 1, Sensor 2)<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>Depending on the severity of the problem, related error codes may also be stored with this DTC. Code 2099 is very similar to error code P2098.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code 2099 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 P2099 Code?<\/h2>\n\n\n\n<p>P2099 is a generic code, so it can have several triggers. Here are the most common:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A faulty sensor (<a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensor\">oxygen sensor<\/a>, <a href=\"https:\/\/www.carparts.com\/mass-air-flow-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"mass air flow sensor\">mass air flow sensor<\/a>, etc.)<\/li>\n\n\n\n<li>Circuit issues, such as damaged <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wires\">wires<\/a> or a poor connection<\/li>\n\n\n\n<li>Exhaust leak<\/li>\n\n\n\n<li>Vacuum leak<\/li>\n\n\n\n<li>Fuel delivery issues<\/li>\n\n\n\n<li>An issue with the PCM, such as software in need of an update<\/li>\n<\/ul>\n\n\n\n<div class=\"cp-search\">\n<div align=\"center\"><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\"><\/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\t<input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\">\n        <input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P2099 Code?<\/h2>\n\n\n\n<p>You may notice the following symptoms if you drive a vehicle that has set a P2099 trouble code:<\/p>\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=\"Active check engine light\">Active check engine light<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/15-fuel-economy-hacks-that-can-save-you-money-at-the-pump\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Excessive fuel consumption\">Excessive fuel consumption<\/a><\/li>\n\n\n\n<li>Poor engine performance<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2099 Code<\/h2>\n\n\n\n<p>If you have sufficient DIY automotive diagnostic and repair experience, you can try using a <a href=\"https:\/\/www.carparts.com\/blog\/p0139-code-o2-sensor-circuit-slow-response-bank-1-sensor-2\/#Using_a_Scan_Tool_Record_Utility\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"scan tool record utility\">scan tool record utility<\/a> to diagnose P2099.<\/p>\n\n\n\n<p>Keep in mind that P2099 is a generic code that may be set across several makes and models. However, this does not mean that there is a one-size-fits-all approach to diagnosing its underlying cause. The steps for troubleshooting this code will vary depending on your vehicle&rsquo;s make and model.<\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/common-questions-asked-by-motorists\/\" target=\"_self\" rel=\"dofollow\" class=\"ufd14d0022324b9176c8385086d4bcce6\"><style> .ufd14d0022324b9176c8385086d4bcce6 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .ufd14d0022324b9176c8385086d4bcce6:active, .ufd14d0022324b9176c8385086d4bcce6:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .ufd14d0022324b9176c8385086d4bcce6 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .ufd14d0022324b9176c8385086d4bcce6 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .ufd14d0022324b9176c8385086d4bcce6 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .ufd14d0022324b9176c8385086d4bcce6:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">Common Questions Asked by Motorists<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>Check out this video to get an idea of what the diagnostic process for this code 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=\"2010 Chevrolet Traverse 3.6l FWD P2099 P0155 P0154\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/qOPsN5VFG9Y?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 P2099 Code<\/h2>\n\n\n\n<p>P2099 may share similar triggers and symptoms with other fault codes. However, that does not mean that they share repair steps as well. All vehicles are different, so make sure to refer to a factory repair guide that is specific to your car.<\/p>\n\n\n\n<p>If you&rsquo;re considering troubleshooting this code on your own, it&rsquo;s a good idea to refresh your auto repair knowledge before attempting any fixes. Always consult the vehicle <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> to learn the appropriate diagnostic and repair procedures for this code. Alternatively, you may leave this job to a professional.<\/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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Code P2099 is one of many trouble codes that may be logged and retrieved from the OBD system. Here is&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":64446,"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":[1190],"ppma_author":[2607,2985],"class_list":{"0":"post-64444","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 v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P2099 Code: Post Catalyst Fuel Trim System Too Rich (Bank 2) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Does your car have a logged P2099? Learn what this code means, its triggers, and the symptoms associated with it 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\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2099 Code: Post Catalyst Fuel Trim System Too Rich (Bank 2) - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Does your car have a logged P2099? Learn what this code means, its triggers, and the symptoms associated with it in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-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=\"2021-12-20T08:44:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-08-20T06:51:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1328\" \/>\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\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com&#039;s thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.\",\"knowsAbout\":\"Auto Repair, Car Maintenance, Auto Parts, Car Reviews\",\"publishingPrinciples\":\"\\\/blog\\\/our-team\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/thecpteam\\\/\",\"sameAs\":\"https:\\\/\\\/www.facebook.com\\\/carpartscom, https:\\\/\\\/twitter.com\\\/CarPartscom, https:\\\/\\\/www.youtube.com\\\/@CarPartscomOfficial\\\/, https:\\\/\\\/www.instagram.com\\\/carpartscom\\\/\"},{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"Richard McCuistian\",\"jobTitle\":\"ASE Master Automobile Technician\",\"description\":\"Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.\",\"knowsAbout\":\"Auto Repair, Car Maintenance, Auto Parts, Car Reviews\",\"publishingPrinciples\":\"\\\/blog\\\/our-team\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/richardmccuistian\\\/\",\"sameAs\":\"https:\\\/\\\/www.linkedin.com\\\/in\\\/richard-mccuistian-2681891b\\\/, https:\\\/\\\/www.youtube.com\\\/user\\\/McCuistian\"}],\"headline\":\"P2099 Code: Post Catalyst Fuel Trim System Too Rich (Bank 2)\",\"datePublished\":\"2021-12-20T08:44:07+00:00\",\"dateModified\":\"2024-08-20T06:51:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/\"},\"wordCount\":779,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2021\\\/12\\\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg\",\"keywords\":[\"oxygen-sensor\"],\"articleSection\":[\"OBD-II Trouble Codes\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/\",\"name\":\"P2099 Code: Post Catalyst Fuel Trim System Too Rich (Bank 2) - In The Garage with CarParts.com\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2021\\\/12\\\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg\",\"datePublished\":\"2021-12-20T08:44:07+00:00\",\"dateModified\":\"2024-08-20T06:51:39+00:00\",\"description\":\"Does your car have a logged P2099? Learn what this code means, its triggers, and the symptoms associated with it in this article.\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2021\\\/12\\\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg\",\"contentUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2021\\\/12\\\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg\",\"width\":2048,\"height\":1328,\"caption\":\"downstream oxygen sensor mounted on exhaust pipe close look\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/\",\"name\":\"In The Garage with CarParts.com\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\",\"name\":\"CarParts.com\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/cp-itg-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/cp-itg-logo.png\",\"width\":2048,\"height\":398,\"caption\":\"CarParts.com\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/carpartscom\",\"https:\\\/\\\/x.com\\\/carpartscom\",\"https:\\\/\\\/www.instagram.com\\\/carpartscom\",\"https:\\\/\\\/www.youtube.com\\\/@CarPartscomOfficial\\\/\"]},{\"@type\":\"Person\",\"@id\":\"\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"P2099 Code: Post Catalyst Fuel Trim System Too Rich (Bank 2) - In The Garage with CarParts.com","description":"Does your car have a logged P2099? Learn what this code means, its triggers, and the symptoms associated with it in this article.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/","og_locale":"en_US","og_type":"article","og_title":"P2099 Code: Post Catalyst Fuel Trim System Too Rich (Bank 2) - In The Garage with CarParts.com","og_description":"Does your car have a logged P2099? Learn what this code means, its triggers, and the symptoms associated with it in this article.","og_url":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/","og_site_name":"In The Garage with CarParts.com","article_publisher":"https:\/\/www.facebook.com\/carpartscom","article_published_time":"2021-12-20T08:44:07+00:00","article_modified_time":"2024-08-20T06:51:39+00:00","og_image":[{"width":2048,"height":1328,"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_creator":"@carpartscom","twitter_site":"@carpartscom","twitter_misc":{"Written by":"","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/#article","isPartOf":{"@id":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/"},"author":[{"@type":"Person","$id":"4","name":"CarParts.com Research Team","jobTitle":"Expert Automotive Writer","description":"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com&#039;s thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.","knowsAbout":"Auto Repair, Car Maintenance, Auto Parts, Car Reviews","publishingPrinciples":"\/blog\/our-team\/","url":"https:\/\/www.carparts.com\/blog\/author\/thecpteam\/","sameAs":"https:\/\/www.facebook.com\/carpartscom, https:\/\/twitter.com\/CarPartscom, https:\/\/www.youtube.com\/@CarPartscomOfficial\/, https:\/\/www.instagram.com\/carpartscom\/"},{"@type":"Person","$id":"4","name":"Richard McCuistian","jobTitle":"ASE Master Automobile Technician","description":"Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.","knowsAbout":"Auto Repair, Car Maintenance, Auto Parts, Car Reviews","publishingPrinciples":"\/blog\/our-team\/","url":"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/","sameAs":"https:\/\/www.linkedin.com\/in\/richard-mccuistian-2681891b\/, https:\/\/www.youtube.com\/user\/McCuistian"}],"headline":"P2099 Code: Post Catalyst Fuel Trim System Too Rich (Bank 2)","datePublished":"2021-12-20T08:44:07+00:00","dateModified":"2024-08-20T06:51:39+00:00","mainEntityOfPage":{"@id":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/"},"wordCount":779,"commentCount":0,"publisher":{"@id":"https:\/\/www.carparts.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/#primaryimage"},"thumbnailUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg","keywords":["oxygen-sensor"],"articleSection":["OBD-II Trouble Codes"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/","url":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/","name":"P2099 Code: Post Catalyst Fuel Trim System Too Rich (Bank 2) - In The Garage with CarParts.com","isPartOf":{"@id":"https:\/\/www.carparts.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/#primaryimage"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/#primaryimage"},"thumbnailUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg","datePublished":"2021-12-20T08:44:07+00:00","dateModified":"2024-08-20T06:51:39+00:00","description":"Does your car have a logged P2099? Learn what this code means, its triggers, and the symptoms associated with it in this article.","inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/#primaryimage","url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg","contentUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg","width":2048,"height":1328,"caption":"downstream oxygen sensor mounted on exhaust pipe close look"},{"@type":"WebSite","@id":"https:\/\/www.carparts.com\/blog\/#website","url":"https:\/\/www.carparts.com\/blog\/","name":"In The Garage with CarParts.com","description":"","publisher":{"@id":"https:\/\/www.carparts.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.carparts.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.carparts.com\/blog\/#organization","name":"CarParts.com","url":"https:\/\/www.carparts.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.carparts.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2025\/03\/cp-itg-logo.png","contentUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2025\/03\/cp-itg-logo.png","width":2048,"height":398,"caption":"CarParts.com"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/carpartscom","https:\/\/x.com\/carpartscom","https:\/\/www.instagram.com\/carpartscom","https:\/\/www.youtube.com\/@CarPartscomOfficial\/"]},{"@type":"Person","@id":"","url":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/"}]}},"featured_image_src":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg","featured_image_src_square":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/downstream-oxygen-sensor-mounted-on-exhaust-pipe-close-look-scaled.jpg","author_info":{"display_name":"","author_link":"https:\/\/www.carparts.com\/blog\/p2099-code-post-catalyst-fuel-trim-system-too-rich-bank-2\/"},"authors":[{"term_id":2607,"user_id":1651,"is_guest":0,"slug":"thecpteam","display_name":"CarParts.com Research Team","avatar_url":{"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg","url2x":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""},{"term_id":2985,"user_id":1646,"is_guest":0,"slug":"richardmccuistian","display_name":"Richard McCuistian, ASE Certified Master Automobile Technician","avatar_url":{"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/richard-mccuistian.png","url2x":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/richard-mccuistian.png"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/64444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/comments?post=64444"}],"version-history":[{"count":0,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/64444\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media\/64446"}],"wp:attachment":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media?parent=64444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/categories?post=64444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/tags?post=64444"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=64444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}