How do I test the o2 sensor?
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This is a discussion on How do I test the o2 sensor? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I am pretty sure from the cel and other peoples experience w it that the problem is my postcat o2 ...

  1. #1
    Registered User Wilz02wrx's Avatar
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    How do I test the o2 sensor?

    I am pretty sure from the cel and other peoples experience w it that the problem is my postcat o2 sensor, but how do i make sure. also the car is running terrible and i cant get the part for days if i just unplug it will it go to some preset settings or safemode or something and run better til i can get the part?
    Dirty Crew #8807
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    Registered User jeffmm06's Avatar
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    Scan your ecu and find out for sure, do you have a aftermarket downpipe?
    2005 WRB WRX "was" STAGE 2

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    He simply abides. SD_GR's Avatar
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    What code number?

    If the CEL code specifies "bank x input high" then removing the O2 sensor entirely should not make any difference. High input means open circuit, and when you remove the sensor you get the same thing. Check for faults in the wiring first.

    Checking the sensor itself requires a multimeter connected to the signal lead with the car running and I've not had to do this, sorry.
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    Registered User Wilz02wrx's Avatar
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    0031 and yeah that sounds right on what it is. o ok What voltage should there be on th wires. i would assume 12ish from other things on cars but didnt know for sure. but thanks for the help
    Dirty Crew #8807
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    He simply abides. SD_GR's Avatar
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    Here's discussion about testing the O2 sensor using a mutlimeter. Keep in mind three things:

    1. I have never done this.
    2. There is no second thing.
    3. I have never done this.

    The reason I caution you is that the O2 sensor leads connect to the ECU, so have a clear plan before bridging any wires with the multimeter's leads.

    http://forums.nasioc.com/forums/show...+oxygen+sensor
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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