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Re: Code Scanner
More likely than not it did tell him which one, he just didn't know it. Each one has it's own code. Without looking up the code, there's no way to tell. P0420 & P0421 are downstream, B1 and B2 respectively. I think the upstreams are P0170 & P0171, but I'm really not too sure.
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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