{"id":71829,"date":"2022-09-01T03:11:14","date_gmt":"2022-09-01T10:11:14","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=71829"},"modified":"2023-09-04T22:44:48","modified_gmt":"2023-09-05T05:44:48","slug":"p2243-code-o2-sensor-reference-voltage-circuit-open","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2243-code-o2-sensor-reference-voltage-circuit-open\/","title":{"rendered":"P2243 Code: O2 Sensor Reference Voltage Circuit \/ Open"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_fcaca8-85 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_fcaca8-85 > .kt-inside-inner-col,.kadence-column_fcaca8-85 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_fcaca8-85 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_fcaca8-85 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_fcaca8-85 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_fcaca8-85 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_fcaca8-85{position:relative;}@media all and (max-width: 1024px){.kadence-column_fcaca8-85 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_fcaca8-85 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_fcaca8-85 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-a86ee9  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-36cad8\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_fcd2ab-f4, .wp-block-kadence-advancedheading.kt-adv-heading_fcd2ab-f4[data-kb-block=\"kb-adv-heading_fcd2ab-f4\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_fcd2ab-f4 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_fcd2ab-f4[data-kb-block=\"kb-adv-heading_fcd2ab-f4\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_fcd2ab-f4 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_fcd2ab-f4[data-kb-block=\"kb-adv-heading_fcd2ab-f4\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_fcd2ab-f4 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_fcd2ab-f4\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Diagnostic trouble code (DTC) P2243 stands for &ldquo;O2 Sensor Reference Voltage Circuit\/Open.&rdquo; If the powertrain control module (PCM) detects an issue with an oxygen (O2) sensor, it might log a code P2243.<\/li><li>The P2243 code is commonly caused by exhaust leaks, failed O2 sensors, wiring issues, and a bad PCM.<\/li><li>The issues causing the P2243 code can show symptoms like poor engine performance and decreased fuel economy.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen (O2) sensor\">oxygen (O2) sensor<\/a> measures the oxygen content in the exhaust to help the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> (PCM) determine the correct air-fuel ratio. It is typically installed in the exhaust manifold or located downstream from the manifold in the exhaust pipe. If the PCM is unable to pick up a signal from the O2 sensor, on-board diagnostics (OBD) will log a P2243 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2243 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) P2243 stands for &ldquo;O2 Sensor Reference Voltage Circuit\/Open.&rdquo;<\/p>\n\n\n\n<p>The PCM relies on the signals sent by the O2 sensor to regulate the <a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-good-air-fuel-ratio-chart-included\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"air-fuel mixture\">air-fuel mixture<\/a>. With the help of metals like zircon and platinum, the O2 sensor generates a voltage based on the oxygen content of the exhaust. The PCM uses this information to adjust the fuel metering at the fuel injectors.<\/p>\n\n\n\n<p>O2 sensors are also used to test and diagnose other systems. For example, PCMs rely on O2 sensor response to determine whether or not enough fuel is being supplied to the engine. Upstream and downstream O2 sensors can also be used to check <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a> efficiency.<\/p>\n\n\n\n<p>If the PCM detects an issue with the O2 sensor, it might log a code P2243.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P2243 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\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/old-downstream-oxygen-sensor-on-catalyst-pipe-of-a-gasoline-car-1024x683.jpg\" alt=\"old downstream oxygen sensor on catalyst pipe of a gasoline car\" class=\"wp-image-71831\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/old-downstream-oxygen-sensor-on-catalyst-pipe-of-a-gasoline-car-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/old-downstream-oxygen-sensor-on-catalyst-pipe-of-a-gasoline-car-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/old-downstream-oxygen-sensor-on-catalyst-pipe-of-a-gasoline-car-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/old-downstream-oxygen-sensor-on-catalyst-pipe-of-a-gasoline-car-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/old-downstream-oxygen-sensor-on-catalyst-pipe-of-a-gasoline-car-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/old-downstream-oxygen-sensor-on-catalyst-pipe-of-a-gasoline-car.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>If the PCM detects an issue with the O2 sensor, code P2243 is one of the OBD codes that it can log.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of the P2243 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Exhaust leak<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/bad-o2-sensor-symptoms-causes-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"O2 sensor failure\">O2 sensor failure<\/a><\/li><li>Wiring issues<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty PCM\">Faulty PCM<\/a><\/li><\/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\">What are the Common Symptoms of the P2243 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Poor engine performance<\/li><li>Increased fuel consumption<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2243 Code<\/h2>\n\n\n\n<p>DTC P2243 is a generic trouble code that can be logged in vehicles with an OBD-II system. However, keep in mind that the steps for diagnosis and repair can vary, depending on the vehicle&rsquo;s specifications.<\/p>\n\n\n\n<p>Diagnosing an O2 sensor usually involves conducting a visual inspection, using a digital voltmeter, scan tool, or a scope. If you&rsquo;re not confident with your skills and knowledge in diagnosing a P2243 code, it might be best to have a certified mechanic inspect your vehicle for you. Otherwise, you can go ahead and diagnose the problem on your own.<\/p>\n\n\n\n<p>Here are a couple of videos you might want to check out to get an idea of what the process could 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=\"2004 honda accord ex 02 oxygen sensor (DTC) P2243\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/2kmGh9_K0MI?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=\"Honda check engine light, codes P0134 , P2243\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/kq6wfDMAorA?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 P2243 Code<\/h2>\n\n\n\n<p>Attempting to fix a P2243 code can be frustrating without the right tools and know-how. So if you&rsquo;re not sure you can address it on your own, it&rsquo;s best to leave the job to the pros.<\/p>\n\n\n\n<p>But if you have advanced technical knowledge, you can fix the issue on your own. Just 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 repair manual\">right repair manual<\/a> before proceeding with your repairs. Guides like those from Chilton or an ALLDATA subscription contain vehicle-specific repair information, so you might want to check those out before you start.<\/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 oxygen (O2) sensor measures the oxygen content in the exhaust to help the powertrain control module (PCM) determine the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2243-code-o2-sensor-reference-voltage-circuit-open\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":71830,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[1314],"tags":[1189,1323,1190],"ppma_author":[2607,2855],"class_list":{"0":"post-71829","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-engine-control-module-2","10":"tag-oxygen-sensor-2","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P2243 Code: O2 Sensor Reference Voltage Circuit \/ Open - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn the definition of code P2243 as well as its common causes and symptoms. Find out the proper way 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\/p2243-code-o2-sensor-reference-voltage-circuit-open\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2243 Code: O2 Sensor Reference Voltage Circuit \/ Open - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn the definition of code P2243 as well as its common causes and symptoms. Find out the proper way to resolve the issue.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p2243-code-o2-sensor-reference-voltage-circuit-open\/\" \/>\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=\"2022-09-01T10:11:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-05T05:44:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/new-oxygen-sensor-part-installed-in-a-modern-car.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1335\" \/>\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\\\/p2243-code-o2-sensor-reference-voltage-circuit-open\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2243-code-o2-sensor-reference-voltage-circuit-open\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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