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Originally Posted by NJSPEEDER
OBD2 cars have O2 sensors before and after the cats, it is supposed to be a system check to make sure the cats are in working order.
if you decide to go !cat then you can delete the codes from the computer for the second set of cats so that it never shows up as a SES light or on a scan.
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He means second set of O2's, just to avoid confusion....
- Justin