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The Water Cooler
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Used Honda Accord opinions
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<blockquote data-quote="4play" data-source="post: 2857204" data-attributes="member: 7223"><p>A loose or leaking fuel cap will turn the ck eng light on but you will get specific codes if your fuel cap or any other component related to the evaporative emissions system is leaking, you wouldn't get a P0420 for that. Without going into great detail the P0420 is basically a self diagnosed code, meaning the oxygen sensors are working correct, but the rear sensor (catalyst monitor) does not like what it's seeing. When the rear oxygen sensor values are similar to the front oxygen sensor, that's when you will see catalyst efficiency codes.</p></blockquote><p></p>
[QUOTE="4play, post: 2857204, member: 7223"] A loose or leaking fuel cap will turn the ck eng light on but you will get specific codes if your fuel cap or any other component related to the evaporative emissions system is leaking, you wouldn't get a P0420 for that. Without going into great detail the P0420 is basically a self diagnosed code, meaning the oxygen sensors are working correct, but the rear sensor (catalyst monitor) does not like what it's seeing. When the rear oxygen sensor values are similar to the front oxygen sensor, that's when you will see catalyst efficiency codes. [/QUOTE]
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