Thread: P0420 CEL ON!
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Old 07-31-2014, 01:41 AM   #4
mtlblue
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Join Date: May 2010
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isnt' that the code for a faulty cat? maybe time for some new o2 sensors.. I had this problem show up on my 99 crv last year, after changing the cat for rust issues, got new sensors but not long after, it started coding, changed the sensors on garantee and after tests, we changed the cat again and that solved it. Before finally finding out that the cat was bad, I learned that you need to run the cat hot on it's first run to set it properly, so it "pops" into place,... or something, but it worked for me. fyi
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