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Old 02-13-2025, 09:27 AM   #2
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,532
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.
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