code??
#1
code??
I have a 00 z28 it keeps throwing a check engine light code.0420 catalyst efficiency below threshold (bank 1). I replaced both oxygen senors on that side, I went and had the code cleared and bout after 150 miles it has came back on. I went and had it checked today and it was this same code again?? The only other thing it could be is the cats i think?? I know i am going to need the o2 simulators, and where is the best place to get them?? I am gonna go tommorrow and see bout cuttin them off, if i go ahead and cut them off without the simulators will may car run okay? I know the check engine light will be on for sure. Thanks guys for all ur replys.
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