is the cat efficiency code a real common gm problem? any fixes? would a high flow cat/02 emmulator fix the problem and still pass I/M?
car is a grand prix 3.8L S/C
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04-13-2010
is the cat efficiency code a real common gm problem? any fixes? would a high flow cat/02 emmulator fix the problem and still pass I/M?
car is a grand prix 3.8L S/C
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