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Thread: How do you know if the 0/2 sensor is working?

  1. #1
    FredMaxwell Guest

    How do you know if the 0/2 sensor is working?

    Is there a code for it?
    There is, isn't there?
    I've never seen one set a code..
    And I don't think there was an alert when I drove without one for a couple days

    How do I know for sure it's working?


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  3. #2
    94greencaddysls is offline Cadillac Owners Fanatic
    Automobile(s): 94 sls
    Join Date
    Feb 2005
    Posts
    235

    Re: How do you know if the 0/2 sensor is working?

    If you have onboard diagnostics you can moniter the voltage and cross counts through that but if you dont a simple scan tool might be able to read that also.

  4. #3
    Join Date
    Oct 2003
    Location
    Staten Island, NY
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    38
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    327

    Re: How do you know if the 0/2 sensor is working?

    PC0139 is one code for the rear O2 sensor for Slow Responce.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
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    69
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    82,272

    Re: How do you know if the 0/2 sensor is working?

    Yes, there are codes for it as NOFEAR has shown. If they are not working, it will set a DTC and the SES light. They are monitored.


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