{"id":71349,"date":"2022-09-01T02:50:21","date_gmt":"2022-09-01T09:50:21","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=71349"},"modified":"2024-08-13T01:54:52","modified_gmt":"2024-08-13T08:54:52","slug":"p0412-code-secondary-air-injection-system-switching-valve-a-circuit","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/","title":{"rendered":"P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit"},"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-column71349_9e37bc-8f > .kt-inside-inner-col,.kadence-column71349_9e37bc-8f > .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-column71349_9e37bc-8f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column71349_9e37bc-8f > .kt-inside-inner-col{flex-direction:column;}.kadence-column71349_9e37bc-8f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column71349_9e37bc-8f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column71349_9e37bc-8f{position:relative;}@media all and (max-width: 1024px){.kadence-column71349_9e37bc-8f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column71349_9e37bc-8f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column71349_9e37bc-8f inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-abba06  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-07a6cd\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading71349_c348b8-e5, .wp-block-kadence-advancedheading.kt-adv-heading71349_c348b8-e5[data-kb-block=\"kb-adv-heading71349_c348b8-e5\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading71349_c348b8-e5 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading71349_c348b8-e5[data-kb-block=\"kb-adv-heading71349_c348b8-e5\"] 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-heading71349_c348b8-e5 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading71349_c348b8-e5[data-kb-block=\"kb-adv-heading71349_c348b8-e5\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading71349_c348b8-e5 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading71349_c348b8-e5\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>On-board diagnostics (OBD) can log a P0412 if the vehicle computer detects a problem with the secondary air injection (SAI) system&rsquo;s &ldquo;A&rdquo; circuit.<\/li>\n\n\n\n<li>Wiring issues, a damaged SAI switching valve, and a clogged or disconnected vacuum hose can trigger a P0412 code.<\/li>\n\n\n\n<li>If this code is present, your vehicle could exhibit symptoms like increased tailpipe emissions and a rich air-fuel mixture.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The secondary air injection (SAI) system forces fresh air into the exhaust system to help in the oxidizing process happening in the <a href=\"https:\/\/www.carparts.com\/exhaust-manifold\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust manifold\">exhaust manifold<\/a> or <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a>. It reduces HC and CO emissions by providing fresh air into the exhaust system.<\/p>\n\n\n\n<p>A typical SAI system has a <a href=\"https:\/\/www.carparts.com\/secondary-air-injection-check-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check valve\">check valve<\/a> that protects other components from reverse exhaust flow, as well as various air management valves. Once the powertrain control module (PCM) detects an issue with the SAI system, it will log a P0412 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0412 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) P0412 stands for &ldquo;Secondary Air Injection System Switching Valve &lsquo;A&rsquo; Circuit.&rdquo;<\/p>\n\n\n\n<p>The SAI system operates during cold engine startup, pumping fresh air into the exhaust and combining it with the post-combustion HC and CO to provide secondary oxidation. This process converts the residual HC and CO to water vapor and CO2. A switching valve is used to allow air to flow from the <a href=\"https:\/\/www.carparts.com\/secondary-air-injection-pump\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"SAI pump\">SAI pump<\/a> to the exhaust stream.<\/p>\n\n\n\n<p>Problems can arise with the switching valve and related components. Once this happens, on-board diagnostics will log a P0412 code.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0412 might 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<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\/2022\/08\/car-exhaust-showing-stainless-exhaust-pipe-1024x683.jpg\" alt=\"car exhaust showing stainless exhaust pipe\" class=\"wp-image-71826\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-exhaust-showing-stainless-exhaust-pipe-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-exhaust-showing-stainless-exhaust-pipe-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-exhaust-showing-stainless-exhaust-pipe-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-exhaust-showing-stainless-exhaust-pipe-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-exhaust-showing-stainless-exhaust-pipe-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-exhaust-showing-stainless-exhaust-pipe-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-exhaust-showing-stainless-exhaust-pipe-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The SAI system operates during cold engine startup, pumping fresh air into the exhaust and combining it with the post-combustion HC and CO to provide secondary oxidation.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of the P0412 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wiring issues<\/li>\n\n\n\n<li>Damaged secondary air pump switching valve<\/li>\n\n\n\n<li>Clogged or disconnected <a href=\"https:\/\/www.carparts.com\/vacuum-hose\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vacuum hose\">vacuum hose<\/a><\/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=\"PCM failure\">PCM failure<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0412 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>Increased tailpipe emissions<\/li>\n\n\n\n<li>Engine running rich<\/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 P0412 Code<\/h2>\n\n\n\n<p>DTC P0412 is a generic powertrain code that vehicles equipped with an OBD-II system can log. But despite being a common trouble code, its steps for diagnosis and repair can vary from one vehicle to another.<\/p>\n\n\n\n<p>If you&rsquo;re not familiar with the process of diagnosing trouble codes, it&rsquo;s a good idea to bring your vehicle to the nearest auto repair shop and have a trained professional do the job for you. Otherwise, you can go ahead and do it yourself.<\/p>\n\n\n\n<p>To help you out, we&rsquo;ve gathered a couple of videos to give you an idea about what the process 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='Code P0410 P0411 P0412 Secondary Air Injection \"Test this First\"' width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/fG44s1263vw?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<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=\"TOYOTA TACOMA CHECK ENGINE LIGHT: p0418, p2441, p2445 air injection pump quick diag\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/g_APfFuJZKY?start=42&amp;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 P0412 Code<\/h2>\n\n\n\n<p>There&rsquo;s not a single solution to fix every trouble code in the book. The steps for fixing DTC P0412 can differ, depending on your vehicle&rsquo;s year, make, and model.<\/p>\n\n\n\n<p>If you&rsquo;re not confident with your DIY skills yet, you can always have a certified mechanic do the job for you to ensure that the right steps are followed. But if you think you have the skills and technical knowledge to do it, then you can go ahead and fix the problem on your own.<\/p>\n\n\n\n<p>Before you start, make sure you have the <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"right tools and repair guides\">right tools and repair guides<\/a>. Manuals like those from Chilton or an ALLDATA subscription contain vehicle-specific repair information, so you might want to check those out before proceeding.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Get New Vacuum Hoses Delivered to Your Home<\/h2>\n\n\n\n<p>While you can try to resolve the P0412 code by unclogging and reconnecting problematic vacuum hoses, you might have to replace the faulty hose. Don&rsquo;t worry. CarParts.com expedites your vehicle&rsquo;s repair by shipping the replacement vacuum hoses that you ordered straight to your doorstep.<\/p>\n\n\n\n<p>CarParts.com operates multiple distribution centers throughout the US. When you purchase a vacuum hose from our online store, our nearest distribution center quickly processes your order and ships your part. You can expect your new part to arrive in as fast as two business days if you live anywhere in the continental US and order by noon ET. Furthermore, we exclusively source our products from manufacturers trusted by drivers across the US, so you can trust in our products&rsquo; quality and durability.<\/p>\n\n\n\n<p>Make CarParts.com your first and only stop for replacement vacuum hoses of the finest quality. Browse our wide selection of <a href=\"https:\/\/www.carparts.com\/vacuum-hose\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vacuum hoses\">vacuum hoses<\/a> and quickly get your new part today!<\/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 secondary air injection (SAI) system forces fresh air into the exhaust system to help in the oxidizing process happening&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":71822,"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":[1189,1238,2058,2064,3211],"ppma_author":[2607,2855],"class_list":{"0":"post-71349","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-catalytic-converter-2","9":"tag-exhaust-manifold-2","10":"tag-secondary-air-injection-check-valve","11":"tag-secondary-air-injection-pump","12":"tag-vacuum-hose-2","13":"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>P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what the P0412 code means and the most common causes that can trigger this code. Plus find out its usual symptoms and what you can do to resolve the issue.\" \/>\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\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what the P0412 code means and the most common causes that can trigger this code. Plus find out its usual symptoms and what you can do to resolve the issue.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-01T09:50:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-08-13T08:54:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1365\" \/>\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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/\"},\"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\":\"William Guzenski\",\"jobTitle\":\"ASE Master Automobile Technician\",\"description\":\"William \u201cBill\u201d Guzenski has produced hundreds of how-to videos for the automotive community. He\u2019s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.\",\"knowsAbout\":\"Auto Repair, Car Maintenance, Auto Parts, Car Reviews\",\"publishingPrinciples\":\"\\\/blog\\\/our-team\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/williamguzenski\\\/\",\"sameAs\":\"\"}],\"headline\":\"P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit\",\"datePublished\":\"2022-09-01T09:50:21+00:00\",\"dateModified\":\"2024-08-13T08:54:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/\"},\"wordCount\":779,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/08\\\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg\",\"keywords\":[\"catalytic-converter\",\"exhaust-manifold\",\"secondary-air-injection-check-valve\",\"secondary-air-injection-pump\",\"vacuum-hose\"],\"articleSection\":[\"OBD-II Trouble Codes\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/\",\"name\":\"P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit - In The Garage with CarParts.com\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/08\\\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg\",\"datePublished\":\"2022-09-01T09:50:21+00:00\",\"dateModified\":\"2024-08-13T08:54:52+00:00\",\"description\":\"Learn what the P0412 code means and the most common causes that can trigger this code. Plus find out its usual symptoms and what you can do to resolve the issue.\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/08\\\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg\",\"contentUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/08\\\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg\",\"width\":2048,\"height\":1365,\"caption\":\"under view of a modern car with exhaust system visible\"},{\"@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\\\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit - In The Garage with CarParts.com","description":"Learn what the P0412 code means and the most common causes that can trigger this code. Plus find out its usual symptoms and what you can do to resolve the issue.","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\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/","og_locale":"en_US","og_type":"article","og_title":"P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit - In The Garage with CarParts.com","og_description":"Learn what the P0412 code means and the most common causes that can trigger this code. Plus find out its usual symptoms and what you can do to resolve the issue.","og_url":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/","og_site_name":"In The Garage with CarParts.com","article_publisher":"https:\/\/www.facebook.com\/carpartscom","article_published_time":"2022-09-01T09:50:21+00:00","article_modified_time":"2024-08-13T08:54:52+00:00","og_image":[{"width":2048,"height":1365,"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_creator":"@carpartscom","twitter_site":"@carpartscom","twitter_misc":{"Written by":"","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/#article","isPartOf":{"@id":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/"},"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":"William Guzenski","jobTitle":"ASE Master Automobile Technician","description":"William \u201cBill\u201d Guzenski has produced hundreds of how-to videos for the automotive community. He\u2019s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.","knowsAbout":"Auto Repair, Car Maintenance, Auto Parts, Car Reviews","publishingPrinciples":"\/blog\/our-team\/","url":"https:\/\/www.carparts.com\/blog\/author\/williamguzenski\/","sameAs":""}],"headline":"P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit","datePublished":"2022-09-01T09:50:21+00:00","dateModified":"2024-08-13T08:54:52+00:00","mainEntityOfPage":{"@id":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/"},"wordCount":779,"commentCount":0,"publisher":{"@id":"https:\/\/www.carparts.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/#primaryimage"},"thumbnailUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg","keywords":["catalytic-converter","exhaust-manifold","secondary-air-injection-check-valve","secondary-air-injection-pump","vacuum-hose"],"articleSection":["OBD-II Trouble Codes"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/","url":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/","name":"P0412 Code: Secondary Air Injection System Switching Valve \u201cA\u201d Circuit - In The Garage with CarParts.com","isPartOf":{"@id":"https:\/\/www.carparts.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/#primaryimage"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/#primaryimage"},"thumbnailUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg","datePublished":"2022-09-01T09:50:21+00:00","dateModified":"2024-08-13T08:54:52+00:00","description":"Learn what the P0412 code means and the most common causes that can trigger this code. Plus find out its usual symptoms and what you can do to resolve the issue.","inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/#primaryimage","url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg","contentUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg","width":2048,"height":1365,"caption":"under view of a modern car with exhaust system visible"},{"@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\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/"}]}},"featured_image_src":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg","featured_image_src_square":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/under-view-of-a-modern-car-with-exhaust-system-visible-scaled.jpg","author_info":{"display_name":"","author_link":"https:\/\/www.carparts.com\/blog\/p0412-code-secondary-air-injection-system-switching-valve-a-circuit\/"},"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":2855,"user_id":1645,"is_guest":0,"slug":"williamguzenski","display_name":"William Guzenski, ASE Certified Master Automobile Technician","avatar_url":{"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/william-bill-guzenski-carparts-ase-certified-technician.png","url2x":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/william-bill-guzenski-carparts-ase-certified-technician.png"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/71349","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=71349"}],"version-history":[{"count":0,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/71349\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media\/71822"}],"wp:attachment":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media?parent=71349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/categories?post=71349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/tags?post=71349"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=71349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}