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Originally Posted by Tech_n
I called the dealership because that is where I got the part from and they said that I can take the car up to them and they check it for free. The guy said that I'll have to do that to get another part.
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If you get the 02 sensor problem fixed with the AC Delco 02 sensor I mentioned in the other thread and get rid of that Bosch one your gas mileage will probably improve.
Plus if the dealer is willing to test the CAT convertor for free I'd take em up on the offer. Being the original and with that high mileage, a damaged or partially clogged CAT can destroy the fuel economy.
Good luck!