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Re: P0420 Error and Poor Performance Posted by Joe [Email] (#444) [Profile/Gallery] (more from Joe) on Thu, 12 Jun 2014 17:26:48 In Reply to: P0420 Error and Poor Performance, Stephen, Thu, 12 Jun 2014 09:09:35 Members do not see ads below this line. - Help Keep This Site Online - Signup |
We went through this with the same car, 2001 V6 SE. The valve cover gaskets had slowly failed, allowing oil to pool in the spark plug wells, this caused the DI's to misfire, gradually at first until the misfire was really bad. My friend, his car, drove it home that way, probably damaging the cat in the process. We've been dealing with an intermittent P0420 code ever since. I would address the misfire first, whatever the cause, it may or may not be related to the P0420 code you have now but it could be and can and will eventually damage the cat.
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