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  1. Member Rides and Project Cars
    I need help on how bypass the o2 sensors on my QR25DE I purchased an aftermarket header to delete the precat and now I keep getting ses codes for the 02 sensors. If anyone knows how to bypass them please help me out and tell me what I need to do.
  2. B15 Sentra (2000 - 2006)
    im throwing a code on my 03 spec because my cat is either going out, or i think it might have trouble reading the 02s on my aftermarket headers..im sort of new to the forum so im sorry if this has been asked before, i searched and found nothing..if one of you could give me some insight or link...
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