[BoxsterInTheSun]

Originally Posted by JFP in PA

P 0420 and 0430 indicate your maim cats are failing, not the O2 sensors. I would clear the codes, take the car for a run, and if the condition returns, you need new cats, which in CA have to be factory units.

Thanks so much. 2 questions if the code returns:

1) Any sense in trying to clean the cats like I've seen done in various youtube videos?

2) Any thoughts on why this code causes the "bog down" issue I mentioned? And the minute I clear the codes that issue vanishes and it drives wonderfully?

Thanks again JFP, always appreciate your help and knowledge!