{"id":19620,"date":"2020-11-30T23:14:17","date_gmt":"2020-12-01T07:14:17","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=19620"},"modified":"2025-03-24T17:25:59","modified_gmt":"2025-03-25T00:25:59","slug":"symptoms-of-a-bad-air-injection-check-valve","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/symptoms-of-a-bad-air-injection-check-valve\/","title":{"rendered":"Symptoms of a Bad Air Injection Check Valve"},"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-column19620_c5c6a8-0a > .kt-inside-inner-col,.kadence-column19620_c5c6a8-0a > .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-column19620_c5c6a8-0a > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column19620_c5c6a8-0a > .kt-inside-inner-col{flex-direction:column;}.kadence-column19620_c5c6a8-0a > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column19620_c5c6a8-0a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column19620_c5c6a8-0a{position:relative;}@media all and (max-width: 1024px){.kadence-column19620_c5c6a8-0a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column19620_c5c6a8-0a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column19620_c5c6a8-0a inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-a219ee  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-fc9a95\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading19620_333510-e1, .wp-block-kadence-advancedheading.kt-adv-heading19620_333510-e1[data-kb-block=\"kb-adv-heading19620_333510-e1\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading19620_333510-e1 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading19620_333510-e1[data-kb-block=\"kb-adv-heading19620_333510-e1\"] 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-heading19620_333510-e1 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading19620_333510-e1[data-kb-block=\"kb-adv-heading19620_333510-e1\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading19620_333510-e1 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading19620_333510-e1\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>If the air injection check valve develops issues, then the check engine light can illuminate. This issue will cause your vehicle to release more emissions and potentially damage the AIR system.<\/strong><\/li>\n\n\n\n<li>An air injection check valve prevents exhaust gases from entering the air injection system.<\/li>\n\n\n\n<li>The secondary air injection (AIR) system supplies air to the exhaust manifolds, the catalytic converter, or both at different times. The additional air helps reduce harmful exhaust gases through oxidation.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>One component that you may not be familiar with is an <a href=\"https:\/\/www.carparts.com\/air-inject-check-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"air injection check valve\">air injection check valve<\/a>. Vehicles that use a secondary air injection (AIR) system to reduce tailpipe emissions have one or more of these valves.<\/p>\n\n\n\n<p>Like any automotive part, an AIR check valve can eventually fail&mdash;and when it does, you may experience a variety of problems.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/opened-car-hood-1024x683.jpeg\" alt=\"opened car hood\" class=\"wp-image-19645\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/opened-car-hood-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/opened-car-hood-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/opened-car-hood-768x513.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/opened-car-hood-1536x1025.jpeg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/opened-car-hood-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/opened-car-hood-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/opened-car-hood.jpeg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">An AIR check valve can eventually fail&mdash;and when it does, you may experience a variety of problems. <\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Symptoms of a Bad Air Pump Check Valve?<\/h2>\n\n\n\n<p>Not all vehicles have an AIR system&#8288;&mdash;but those that do can experience problems with an AIR check valve (also known as an air inject check valve or an air pump check valve).<\/p>\n\n\n\n<p>Common symptoms of a bad AIR check valve include:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Illuminated Check Engine Light<\/h3>\n\n\n\n<p>Your car&rsquo;s primary computer, which is often referred to as the powertrain control module (PCM), monitors the operation of the AIR system. If the module detects a problem due to a faulty check valve, it will turn on the check engine light and store a diagnostic trouble code (DTC) in its memory.<\/p>\n\n\n\n<p>Common air injection-related DTCs include P0410, <a href=\"https:\/\/www.carparts.com\/blog\/p0411-code-secondary-air-injection-incorrect-flow-detected\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P0411\">P0411<\/a>, all through P0419.<\/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<h3 class=\"wp-block-heading\">Increased Tailpipe Emissions<\/h3>\n\n\n\n<p>The primary goal of the AIR system is to reduce tailpipe emissions. A faulty AIR check valve can block the flow of air into the exhaust stream, hindering the AIR system&rsquo;s performance and causing vehicle emissions to increase.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Damage to Other Parts of the AIR System<\/h3>\n\n\n\n<p>The AIR check valve prevents reverse exhaust flow from entering the AIR system. If the check valve fails, hot exhaust gases can sneak back into the system, damaging components, such as the air pump and air management valves.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"678\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/check-engine-light-error-signal-1024x678.jpeg\" alt=\"check engine light error signal\" class=\"wp-image-19649\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/check-engine-light-error-signal-1024x678.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/check-engine-light-error-signal-300x199.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/check-engine-light-error-signal-768x509.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/check-engine-light-error-signal-1536x1017.jpeg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/check-engine-light-error-signal-scaled.jpeg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/check-engine-light-error-signal-150x99.jpeg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\"> If the module detects a problem due to a faulty check valve, it will turn on the check engine light and store a diagnostic trouble code (DTC) in its memory.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What is an Air Injection Check Valve?<\/h2>\n\n\n\n<p>To better understand AIR check valves, it helps to know how the AIR system works. As was mentioned, not all vehicles have an AIR system, but those that do use the technology to reduce tailpipe emissions.<\/p>\n\n\n\n<p>Depending\non the vehicle, the AIR system may supply air to the exhaust manifolds, the\ncatalytic converter, or both at different times. The additional air helps\nreduce harmful exhaust gases through oxidation. Also, the catalytic converter\nwarms up more quickly when air is added to the exhaust manifolds.<\/p>\n\n\n\n<p>The\nprimary components found within a typical AIR system include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Air pump (either electric or engine-driven): Supplies air to the AIR system.<\/li>\n\n\n\n<li>Air management solenoids and valves: Direct air to the check valves and the exhaust manifolds or catalytic converter. There may also be valves that direct air to the atmosphere.<\/li>\n\n\n\n<li>Check valves: Prevent hot exhaust gases from backing up into the AIR system.<\/li>\n\n\n\n<li>Necessary plumbing (i.e., hoses and pipes): Connect the various parts of the AIR system.<\/li>\n\n\n\n<li>Powertrain control module (PCM): Controls the air management solenoids and monitors the operation of the AIR system.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1500\" height=\"1200\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/air-inject-check-valve.jpg\" alt=\"air inject check valve\" class=\"wp-image-19640\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/air-inject-check-valve.jpg 1500w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/air-inject-check-valve-300x240.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/air-inject-check-valve-1024x819.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/air-inject-check-valve-768x614.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/11\/air-inject-check-valve-150x120.jpg 150w\" sizes=\"(max-width: 1500px) 100vw, 1500px\"><figcaption class=\"wp-element-caption\"> Not all vehicles have an AIR system, but those that do use the technology to reduce tailpipe emissions. <\/figcaption><\/figure>\n\n\n\n<p>Usually, when the engine is cold, the PCM commands the air management solenoids to direct airflow to the exhaust manifolds. Once the engine warms up, the module commands the solenoids to direct airflow to the catalytic converter.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> There are also some systems that direct airflow exclusively to the exhaust manifolds.<\/em><\/p>\n\n\n\n<p>As for the check valves, they typically operate in response to airflow and exhaust backpressure. Airflow from the AIR system will cause a check valve to open, whereas extreme exhaust backpressure (from a <a href=\"https:\/\/www.carparts.com\/blog\/why-does-a-car-backfire\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"backfire\">backfire<\/a>, etc.) will force a valve to close.<\/p>\n\n\n\n<p>Depending on the system design, there may be just one check valve or multiple check valves. Some check valves are exclusively passive devices, while others are operated by the PCM under certain conditions.<\/p>\n\n\n\n<p>Here is a\nhelpful video that gives an overview of how a typical AIR system works:<\/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=\"Air Injection Reaction (A.I.R.) Diagnosis and Understanding-Pt1\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/rantuJlJtdc?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\">Can You Drive With a Bad Air Injection Check Valve?<\/h2>\n\n\n\n<p>Though it&rsquo;s better to have the air injection check valve repaired as soon as possible, it is still safe to drive a vehicle even if it&rsquo;s damaged. A faulty air injection system won&rsquo;t significantly affect your vehicle&rsquo;s performance and maneuverability, nor will it compromise your safety while driving.<\/p>\n\n\n\n<p>However, it will affect your emissions and likely trigger a check engine light warning. You&rsquo;ll also be more likely to fail an emissions test with a bad air injection check valve.<\/p>\n\n\n\n<p><\/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>One component that you may not be familiar with is an air injection check valve. Vehicles that use a secondary&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/symptoms-of-a-bad-air-injection-check-valve\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":29,"featured_media":19643,"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":[52,3750],"tags":[2057],"ppma_author":[2622],"class_list":{"0":"post-19620","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-exhaust-system","9":"tag-air-inject-check-valve","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Symptoms of a Bad Air Injection Check Valve - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"An AIR check valve can eventually fail\u2014and when it does, you may experience a variety of problems. 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