{"id":39971,"date":"2022-05-06T09:16:11","date_gmt":"2022-05-06T09:16:11","guid":{"rendered":" https:\/\/dev.way.com\/blog\/?p=39971"},"modified":"2022-05-09T12:41:58","modified_gmt":"2022-05-09T12:41:58","slug":"p0420-code-what-it-is-and-how-to-fix-it","status":"publish","type":"post","link":"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/","title":{"rendered":"P0420 Code: What It Is and How to Fix It"},"content":{"rendered":"<p style=\"text-align: center;\"><em>A P0420 code indicates that your vehicle&#8217;s computer (PCM) has detected a problem with the catalytic converter. The catalytic converter&#8217;s function is to break down dangerous pollutants produced during the combustion cycle, lowering emissions released through the exhaust pipe. While this code poses no hazard to the driver, they\u00a0should fix it as soon as possible to avoid more issues, including a failed emissions test.\u00a0<\/em><\/p>\n<p><a href=\"https:\/\/www.way.com\/way-plus\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-24379 size-full\" src=\"https:\/\/blog.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt5_970x90px_V01_080921.jpg\" alt=\"Save on car services\" width=\"970\" height=\"90\" srcset=\"http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt5_970x90px_V01_080921.jpg 970w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt5_970x90px_V01_080921-300x28.jpg 300w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt5_970x90px_V01_080921-768x71.jpg 768w\" sizes=\"auto, (max-width: 970px) 100vw, 970px\" \/><\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #e71346;color:#e71346\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #e71346;color:#e71346\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#What_is_a_P0420_code\" >What is a P0420 code?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#How_serious_is_engine_fault_code_P0420\" >How serious is engine fault code P0420?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#Can_you_still_drive_with_P0420\" >Can you still drive with P0420?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#How_to_diagnose_code_P0420\" >How to diagnose code P0420\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#What_are_the_signs_of_a_P0420_code\" >What are the signs of a P0420 code?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#What_are_some_possible_causes_of_a_P0420\" >What are some possible causes of a P0420?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#How_hard_is_it_to_examine_a_P0420_Code\" >How hard is it to examine a P0420 Code?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#How_much_does_DTC_P0420_repair_cost\" >How much does DTC P0420 repair cost?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#Can_I_repair_the_P0420_engine_code_at_home\" >Can I repair the P0420 engine code at home?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#How_expensive_are_catalytic_converters\" >How expensive are catalytic converters?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#How_do_I_fix_P0420_exhaust_leaks\" >How do I fix P0420 exhaust leaks?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/#Finding_the_right_coverage_for_your_car\" >Finding the right coverage for your car\u00a0<\/a><\/li><\/ul><\/nav><\/div>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_is_a_P0420_code\"><\/span><span data-contrast=\"none\">What is a P0420 code?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Simply put, a P0420 code means that the catalyst system efficiency of your car is below threshold (Bank 1).\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">The P0420 error number indicates a low catalyst system efficiency. This is usually caused by issues with your vehicle&#8217;s exhaust or fuel systems. It can be difficult to diagnose at times.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">A car\u2019s catalytic converter is a part of its\u00a0exhaust system. It functions by converting the unburned fuel and carbon monoxide (CO) from the combustion process into carbon dioxide (CO2) and water (H2O). It also converts NOx (nitrogen oxides) to nitrogen.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-39975\" src=\"https:\/\/blog.way.com\/wp-content\/uploads\/2022\/05\/po240-catalytic-converter-trouble.jpg\" alt=\"p0240 catalytic converter trouble\" width=\"640\" height=\"427\" srcset=\"http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/05\/po240-catalytic-converter-trouble.jpg 1000w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/05\/po240-catalytic-converter-trouble-300x200.jpg 300w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/05\/po240-catalytic-converter-trouble-768x512.jpg 768w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/05\/po240-catalytic-converter-trouble-600x400.jpg 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/p>\n<p><span data-contrast=\"auto\">The converter employs two oxygen sensors, one upstream and one downstream. If these sensors produce comparable results, something is wrong. When the Powertrain Control Module (PCM) triggers the P0420 code, the check engine light illuminates, alerting you to a catalyst problem.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Do note that several more circumstances could result in fault P0420. However, the code usually indicates a problem with the catalyst\/emissions system.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"How_serious_is_engine_fault_code_P0420\"><\/span><span data-contrast=\"none\">How serious is engine fault code P0420?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Engine fault P0420 isn&#8217;t frequently a threat to driving safety. The defect is unlikely to cause serious drivability or reliability issues. However, your engine may be emitting more dangerous pollutants because the catalyst system on bank 1 is underperforming. As a result of this coupled with the check engine light, you are unlikely to pass emissions inspections.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Like with any engine problem, the safest option is to diagnose and repair the P0420 problem as quickly as feasible. So we&#8217;re not suggesting that you overlook these difficulties for weeks or months. Rather, it&#8217;s probably safe to keep driving with engine code P0420. Use your best judgment. Play it safe if the automobile feels risky or if there are other engine codes, major symptoms, etc.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Can_you_still_drive_with_P0420\"><\/span><span data-contrast=\"none\">Can you still drive with P0420?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Yes, it is safe to drive with P0420 present in most instances. Aside from the check engine light blinking, a person may not notice any substantial changes in how a car performs.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">For example, if you detect the engine running lean, it&#8217;s advisable not to drive it or, at the very least, keep the throttle input and RPMs low. Lean engine operation may put the engine in danger of more significant issues. Driving with insufficient power and other drivability difficulties might also endanger one&#8217;s safety.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p>You&#8217;ll find more info on <a href=\" https:\/\/dev.way.com\/blog\/drive-car-without-catalytic-converter\/\" target=\"_blank\" rel=\"bookmark noopener\">can you drive a car without a catalytic converter?<\/a><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"How_to_diagnose_code_P0420\"><\/span><span data-contrast=\"none\">How to diagnose code P0420<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Here&#8217;s a quick rundown of how to troubleshoot and diagnose the P0420 engine code:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\">First off, make sure that P0420 is the only engine code present.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Clear the code and drive for approximately 15 minutes. Check to see if the code is returned. If not, repeat the process a few times to be sure. If DTC P0420 appears, there is a genuine problem.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Examine the exhaust system physically for any damage, holes, rust, or other potential leaks. Don&#8217;t forget about the exhaust manifold, a common source of leaks.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Examine the voltage value from the O2 sensor. On most engines, standard readings should be about 0.4 to 0.5 volts. If it&#8217;s dramatically off or bouncing about, it&#8217;s most likely due to a problem with the catalytic converter.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Engines occasionally experience minor problems, and fault codes occur at random. In these circumstances, just clearing and deleting the code may be sufficient to resolve the issue. Otherwise, it&#8217;s time to figure out what&#8217;s triggering DTC P0420. The techniques outlined above are fairly successful for exhaust leaks and cat failure. However, if you&#8217;re receiving additional engine codes, you&#8217;ll need to be a little more creative and problem-solving.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<\/ul>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_are_the_signs_of_a_P0420_code\"><\/span><span data-contrast=\"none\">What are the signs of a P0420 code?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">The first and most common sign of a P0420 code is the activation of your check engine light. Second, your engine will not operate as smoothly as usual, which may prevent you from exceeding 30 to 40 mph.\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">This is due to a decrease in engine power output. You may also detect a rotten egg odor coming from the exhaust. This also occurs when the catalytic converter is used in excess or outside normal driving conditions.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_are_some_possible_causes_of_a_P0420\"><\/span><span data-contrast=\"none\">What are some possible causes of a P0420?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">A malfunctioning catalytic converter is the usual suspect for a P0420 code.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Some more possible causes are:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">Damage to or leakage from the exhaust manifold<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"auto\">Damage or leaking in the exhaust pipe<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Engine misfire<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Contamination of catalytic converter oil<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Sensor for engine coolant temperature that isn&#8217;t working properly<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">A malfunctioning oxygen sensor in the back or front<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Damage to the oxygen wiring<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">The O2 wiring has a loose connection<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Leaking fuel injectors<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Excessive fuel pressure<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Using the incorrect gasoline type in your car (i.e., leaded instead of unleaded fuel)<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<\/ul>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"How_hard_is_it_to_examine_a_P0420_Code\"><\/span><span data-contrast=\"none\">How hard is it to examine a P0420 Code?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Before you begin any repairs, you must correctly diagnose the P0420 error code. Most service technicians will use an OBD-II scanner to acquire the specific code displayed by the Power Control Module (PCM). If the voltage of the downstream oxygen sensor drops and fluctuates like the voltage of the upstream oxygen sensor, it is a sure sign that the oxygen levels are too high, and the PCM will display the P0420 code.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">However, if there are no evident abnormalities with the upstream and downstream oxygen readings, the mechanic will check for engine misfires, ignition problems, and even faults in the fuel system. The mechanic may also inspect the rear O2 sensor for excessive wear or damage.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">An expert will test drive the vehicle and monitor the freeze-frame data. This enables them to establish whether or not the back O2 sensor is functioning properly. Finally, we recommend updating the PCM to the most recent version in case something is wrong with it. It&#8217;s not uncommon for an out-of-date PCM to be the source of your vehicle&#8217;s problems.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/www.way.com\/way-plus\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-24369 size-full\" src=\"https:\/\/blog.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt8_970x90px_V01_080921.jpg\" alt=\"Save on car services\" width=\"970\" height=\"90\" srcset=\"http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt8_970x90px_V01_080921.jpg 970w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt8_970x90px_V01_080921-300x28.jpg 300w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt8_970x90px_V01_080921-768x71.jpg 768w\" sizes=\"auto, (max-width: 970px) 100vw, 970px\" \/><\/a><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"How_much_does_DTC_P0420_repair_cost\"><\/span><span data-contrast=\"none\">How much does DTC P0420 repair cost?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">The cost of repairing DTC P0420 varies greatly depending on the diagnosis. If it&#8217;s just a minor exhaust leak, you might be able to weld the holes yourself for next to nothing. Catalytic converters, on the other hand, can be costly. Essentially, P0420 repairs might cost anywhere from $10 to $2,000 or more.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Can_I_repair_the_P0420_engine_code_at_home\"><\/span><span data-contrast=\"none\">Can I repair the P0420 engine code at home?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">You certainly can repair the P0420 engine code at home. But there&#8217;s a hitch -it is absolutely essential to correctly diagnose the problem before proceeding with any modifications. Depending on the source of the problem, you may need to:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"3\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">Change the catalytic converter.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"3\" aria-setsize=\"-1\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"auto\">Replace one or both O2 sensors.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"3\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Replace the wiring or connectors for the O2 sensor.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">You may also need to repair or replace the muffler, update the software on your car, or replace any leaking exhaust system components. If you&#8217;re unsure what repairs your automobile requires, take it to a professional for a comprehensive diagnostic inspection and repairs.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_expensive_are_catalytic_converters\"><\/span><span data-contrast=\"auto\">How expensive are catalytic converters?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">They can be quite pricey. Platinum, palladium, and rhodium are some expensive metals found in catalytic converters. All of them are high-priced materials that result in a high-priced catalytic converter. New ones can cost anything from $500 to $2,000 or more. You can find used ones for as little as a couple of hundred dollars, but be wary of possible faulty parts.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"How_do_I_fix_P0420_exhaust_leaks\"><\/span><span data-contrast=\"none\">How do I fix P0420 exhaust leaks?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">P0420 is a typical error code caused by exhaust leakage. First, examine the exhaust system for evident damage. Welding could be a simple and inexpensive solution. However, if your exhaust is in bad general condition, it will most likely only be a temporary repair. After that, it could come down to the necessity for a new exhaust system, exhaust manifold, etc.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p>While on this, make sure to<a href=\" https:\/\/dev.way.com\/blog\/how-to-clean-a-catalytic-converter\/\" target=\"_blank\" rel=\"bookmark noopener\"> clean your catalytic converter efficiently.<\/a><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Finding_the_right_coverage_for_your_car\"><\/span><span data-contrast=\"none\">Finding the right coverage for your car<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">In situations like these, you might wonder if your auto insurance covers catalytic converters or <a href=\" https:\/\/dev.way.com\/blog\/does-insurance-cover-catalytic-converter-theft\/\" target=\"_blank\" rel=\"noopener\">catalytic converter thefts<\/a>. Way.com can help keep your auto insurance expenses low while giving you the coverage you need. <\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">What&#8217;s more, there&#8217;s no need to fill out forms or visit an insurance office. Just download the Way.com app, answer a few questions, and let us take care of it.<\/span><\/p>\n<p><a href=\"https:\/\/www.way.com\/way-plus\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-24380 size-full\" src=\"https:\/\/blog.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt6_500x500px_V01_080921.jpg\" alt=\"Save on car services\" width=\"500\" height=\"500\" srcset=\"http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt6_500x500px_V01_080921.jpg 500w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt6_500x500px_V01_080921-150x150.jpg 150w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2021\/08\/1148169_BlogAdBanner_Opt6_500x500px_V01_080921-300x300.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<hr \/>\n<p style=\"text-align: center;\"><em>Here\u2019s more info on\u00a0<\/em><a href=\"https:\/\/www.way.com\/airport-parking\"><em><span data-preserver-spaces=\"true\">top-rated airport parking<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">,\u00a0<\/span><\/em><a href=\"https:\/\/www.way.com\/cities\"><em><span data-preserver-spaces=\"true\">the best parking spots in your city<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">, the most affordable\u00a0<\/span><\/em><a href=\"https:\/\/www.way.com\/auto-insurance\"><em><span data-preserver-spaces=\"true\">auto insurance\u00a0<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">for your car, and\u00a0<\/span><\/em><a href=\"https:\/\/www.way.com\/car-wash-near-me\"><em><span data-preserver-spaces=\"true\">top-rated car washes near you<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">.<\/span><\/em><\/p>\n<hr \/>\n<p style=\"text-align: center;\">\n","protected":false},"excerpt":{"rendered":"<p>A P0420 code indicates that your vehicle&#8217;s computer (PCM) has detected a problem with the catalytic converter. The catalytic converter&#8217;s function is to break down dangerous pollutants produced during the combustion cycle, lowering emissions released through the exhaust pipe. While this code poses no hazard to the driver, they\u00a0should fix it as soon as possible&hellip; <a class=\"more-link\" href=\"https:\/\/dev.way.com\/journal\/p0420-code-what-it-is-and-how-to-fix-it\/\">Continue reading <span class=\"screen-reader-text\">P0420 Code: What It Is and How to Fix It<\/span><\/a><\/p>\n","protected":false},"author":12,"featured_media":39974,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[605,5676,5276],"tags":[],"class_list":["post-39971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-car-care-tips","category-engine-codes","category-catalytic-converter","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.3 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>P0420 Code: What It Is and How to Fix It<\/title>\n<meta name=\"description\" content=\"A P0420 code indicates that your vehicle&#039;s computer (PCM) has detected a problem with the catalytic converter. 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