{"id":32452,"date":"2017-11-15T09:43:37","date_gmt":"2017-11-15T14:43:37","guid":{"rendered":"http:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=32452"},"modified":"2024-02-11T12:02:50","modified_gmt":"2024-02-11T20:02:50","slug":"code-p0420-2005-saturn-ion-2","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/11\/code-p0420-2005-saturn-ion-2","title":{"rendered":"Code P0420 2005 Saturn Ion-2 2.2 L 4 cylinder"},"content":{"rendered":"<p><a href=\"\/\/www.freeautomechanic.com\/checkenginelight.html\"><img decoding=\"async\" class=\"alignnone size-full wp-image-34291\" src=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/02\/2006-saturn-ion.jpg\" alt=\"Saturn Ion\" width=\"600\" height=\"338\" srcset=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/02\/2006-saturn-ion.jpg 600w, https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/02\/2006-saturn-ion-300x169.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<h3>Code P0420<\/h3>\n<p><a href=\"\/\/www.freeautomechanic.com\/checkenginelight.html\">Engine light<\/a> came on. We get two codes, both showing P0420. Since this code came up twice, does this mean that the catalytic converter needs to be replaced? Or should I try replacing the downstream oxygen sensor first?<\/p>\n<hr \/>\n<p>The most common reason for code P0420 is a failed catalytic converter. The code appears because the sensor has detected this failure. Now of course you would want to rule out that the sensor is functioning. This can be done with a <a href=\"https:\/\/www.freeautomechanic.com\/scantools.html\">scan tool<\/a> by looking at the voltage readings. You might want to rule out the less expensive options before replacing any parts.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.freeautomechanic.com\/ho2s-heated-oxygen-sensor.html\"><strong>Testing the O2Sensor<\/strong><\/a><\/li>\n<\/ul>\n<h3>Saturn Code P0420<\/h3>\n<p>Description: Catalyst System Efficiency Below Threshold Bank 1<\/p>\n<h4>P0420 Probable Causes:<\/h4>\n<ol>\n<li>Sensor or solenoid faulty<\/li>\n<li>Connector terminal contact is damaged or corroded<\/li>\n<li><a href=\"https:\/\/www.freeautomechanic.com\/wiring-harness.html\">Wire harness<\/a> &#8211; Check harness for correct voltage, open, short to ground or short to voltage<\/li>\n<li>Update control unit software &#8211; Check for the latest control unit update<\/li>\n<li>Powertrain or Engine Control Module faulty<\/li>\n<li>HO2S sensor contamination\/damaged<\/li>\n<li>Exhaust leaks or restrictions<\/li>\n<li>Catalytic converter damage<\/li>\n<li>Catalytic converter improper operation<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Code P0420 Engine light came on. We get two codes, both showing P0420. Since this code came up twice, does this mean that the catalytic converter needs to be replaced? Or should I try replacing the downstream oxygen sensor first? The most common reason for code P0420 is a failed catalytic converter. The code appears&hellip;&nbsp;<a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/11\/code-p0420-2005-saturn-ion-2\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Code P0420 2005 Saturn Ion-2 2.2 L 4 cylinder<\/span><\/a><\/p>\n","protected":false},"author":13011,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,62],"tags":[9550,20631,9644,20628],"class_list":["post-32452","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-saturn","tag-code-p0420","tag-code-p0420-probable-causes","tag-ion","tag-ion-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Code P0420 2005 Saturn Ion-2 2.2 L 4 cylinder - FreeAutoMechanic Advice<\/title>\n<meta name=\"description\" content=\"Engine light came on. 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Since this code came up twice, does this mean that the catalytic converter needs to be replaced?\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/11\/code-p0420-2005-saturn-ion-2\" \/>\n<meta property=\"og:site_name\" content=\"FreeAutoMechanic Advice\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/freeautomechanic\" \/>\n<meta property=\"article:published_time\" content=\"2017-11-15T14:43:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-11T20:02:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/02\/2006-saturn-ion.jpg\" \/>\n<meta name=\"author\" content=\"Suzanne Merritt\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Suzanne Merritt\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Code P0420 2005 Saturn Ion-2 2.2 L 4 cylinder - FreeAutoMechanic Advice","description":"Engine light came on. 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