{"id":1238,"date":"2025-09-16T11:58:38","date_gmt":"2025-09-16T11:58:38","guid":{"rendered":"https:\/\/www.way.com\/ask\/?p=1238"},"modified":"2025-09-19T03:46:51","modified_gmt":"2025-09-19T03:46:51","slug":"what-is-the-code-p0420-on-a-honda","status":"publish","type":"post","link":"https:\/\/www.way.com\/ask\/what-is-the-code-p0420-on-a-honda\/","title":{"rendered":"What is the code P0420 on a Honda?"},"content":{"rendered":"<p>So, when this code shows up, your car\u2019s catalytic converter won\u2019t convert exhaust pollutants efficiently, resulting in higher emissions. The powertrain control module (PCM) finds out the issue by comparing data from the upstream and downstream oxygen sensors. The code usually appears on models like the CR-V and Accord.<\/p>\n<h2>What are the symptoms of code P0420 Honda?<\/h2>\n<p>The most clear symptom is the check engine light turned on. These are some other signs you can observe.<\/p>\n<ul>\n<li>Decreased fuel economy<\/li>\n<li>Engine performance drops<\/li>\n<li>Failed emissions test<\/li>\n<li>Rotten egg smell from the exhaust<\/li>\n<\/ul>\n<h2>What causes Honda DTC P0420?<\/h2>\n<p>These are some reasons why the error code shows up in your car.<\/p>\n<ul>\n<li>Damaged catalytic converter<\/li>\n<li>Defective oxygen sensors<\/li>\n<li>Fuel system issues<\/li>\n<li>Misfiring engine<\/li>\n<li>Exhaust leakage<\/li>\n<\/ul>\n<figure id=\"attachment_1291\" aria-describedby=\"caption-attachment-1291\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1291\" src=\"https:\/\/www.way.com\/ask\/wp-content\/uploads\/2025\/09\/P0420-Honda.jpg\" alt=\"P0420 Honda\" width=\"1000\" height=\"667\" \/><figcaption id=\"caption-attachment-1291\" class=\"wp-caption-text\"><em>Image by <a href=\"https:\/\/www.freepik.com\/premium-photo\/motor-service-maintenance-motorbike-concept_3078638.htm#fromView=search&amp;page=2&amp;position=7&amp;uuid=e8d0e15f-68d8-4c92-9641-917fbc55c604&amp;query=obd+scan+tool\" target=\"_blank\" rel=\"noopener\"><br \/>rawpixel.com\/Freepik<\/a><\/em><\/figcaption><\/figure>\n<h2>How to fix the P0420 code in a Honda<\/h2>\n<p>The following repairs can help you fix the error code.<\/p>\n<ul>\n<li>Replace the catalytic converter<\/li>\n<li>Replace the defective oxygen Sensors<\/li>\n<li>Repair the exhaust if there\u2019s leakage<\/li>\n<li>Replace the ignition coil or spark plugs to fix the misfiring engine<\/li>\n<li>Clean the fuel injectors<\/li>\n<\/ul>\n<h2>Is it safe to drive a Honda with a P0420?<\/h2>\n<p><strong>No, it isn\u2019t safe to drive with this engine code for a long period. As the code implies an issue with the catalytic converter, driving for long can cause possible damage to the engine or catalytic converter, resulting in decreased fuel economy and higher emissions.<\/strong> The repair cost ranges between $50 and $3,000.<\/p>\n<h3>What does code P0420 mean on a Honda Accord?<\/h3>\n<p>P0420 Honda Accord\u200b implies \u201cCatalyst System Efficiency Below Threshold (Bank 1),\u201d meaning the powertrain control module sensed that the catalytic converter\u2019s Bank 1 is failing.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>So, when this code shows up, your car\u2019s catalytic converter won\u2019t convert exhaust pollutants efficiently, resulting in higher emissions. The powertrain control module (PCM) finds out the issue by comparing data from the upstream and downstream oxygen sensors. The code usually appears on models like the CR-V and Accord. What are the symptoms of code&hellip; <a class=\"more-link\" href=\"https:\/\/www.way.com\/ask\/what-is-the-code-p0420-on-a-honda\/\">Continue reading <span class=\"screen-reader-text\">What is the code P0420 on a Honda?<\/span><\/a><\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1238","post","type-post","status-publish","format-standard","hentry","category-car-repair-maintenance","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is the code P0420 on a Honda?<\/title>\n<meta name=\"description\" content=\"What is code P0420 Honda? Is the code serious? What are the symptoms and causes of this engine code? 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