o2 sensor big voltage
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This is a discussion on o2 sensor big voltage within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; G'day all Cars running really rough at idle and through up a P0420 CEL plugged it in to the computer ...

  1. #1
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    o2 sensor big voltage

    G'day all

    Cars running really rough at idle and through up a P0420 CEL

    plugged it in to the computer and checked it all out and the voltage for the 2nd o2 (lambda) sensor is reading unusually high like 3-8 volts, the front one is perfect running between 0.2-0.8v and fluctuating.

    Problem is though i dont know if this is normal or not? anyone know anything about sensors.

    Im running, 2002 WRX, no BOV, fully decatted, stage 2 map, CAI K&N typhoon

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  3. #2
    Admiral Ackbar mycologist's Avatar
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    Your intake may likely not be approved for your map. Check the notes (assuming it wasn't custom tuned)

    The O2 sensor is due to the cats being gone. Your map should have that CEL disabled. You can also get a resistor and put it in there.

    Are you sure your map flashed correctly?
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

  4. #3
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    pretty sure yeh, it was remapped by ECUtek with the intake on, the CEL is in the history, and when i cleared it, it still was in the history but came up again. Its been fine for over a year, so im quite confused

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