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It was an independent shop that replaced the cats 7 years ago,
It's the local Porsche dealership that is telling me both cats are bad and that the OBD probably went to sleep over the Winter storage, and that it can possibly take thousands of miles for the OBD to reset and start reporting again. I don't know how I could find any shop more qualified that the dealer, but it just doesn't seem logical that both cats would fail at the same time, nor that I could drive under so many different conditions for 3200 miles before the OBD wakes up again.
DBear
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