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o2 sensor

  1. B15 Sentra (2000 - 2006)
    I discovered that my o2 sensor plug had fallen out one day so bought and installed a new one, this fixed the wrx boxer like engine sound coming out of the exhaust and temporarily turned off the check engine light. Unfortunately this only lasted for a couple miles of driving before the sound and...
  2. 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.
  3. B15 Sentra (2000 - 2006)
    i bought i megan header to replace the precat. I still have the second cat futher downstream. will i have to do the non fouler trick and would i put the non foulers on the first or second o2 sensor?
  4. Troubleshooting and Support
    Greetings fellow sufferers. My lovely Primera with QR25 engine continues to behave like a spoiled kid - happy for a minute then grumpy and pissed off for no reason. It generally starts nicely from cold then deteriorates to being hard to start and having a lumpy idle when warm. I have already...