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Thread: O2 Sensor

  1. #1
    SJC is offline Cadillac Owners Member
    Automobile(s): Cadillac CTS
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    Question O2 Sensor

    I have the dreaded check engine light. I pulled the codes and I have P0158 Mod$11 O2 Sensor Circuit High Voltage Bank 2 Sensor 2. How hard is it to change and where is it? I have worked on early GMs and remember only having 1 O2 sensor.
    TIA
    Steve


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  3. #2
    Kael's Avatar
    Kael is offline Cadillac Owners Connoisseur
    Automobile(s): The Mighty Kael, 2004 Black CTS, Every Option
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    Re: O2 Sensor

    underneath the car on top of the cats.

    now as to which side is bank 2... i dunno but would love to find out.

    I think its passenger side.

  4. #3
    odysseus's Avatar
    odysseus is offline Cadillac Owners Connoisseur
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    Re: O2 Sensor

    There will be one in front of each Cat and one behind each cat. They're accessible from under the car, pretty easily. I believe Bank 2 Sensor 2 is the rearmost passenger side sensor. But if one is going bad (due to eventual carbon buildup), then they're all going to do the same thing soon. Most manufacturers recommend changing them every 100k miles (some at 60K!). Most people I know don't' change them until the check engine light comes on. The O2 sensor isn't just for emissions. It's part of the feedback loop on the fuel injection that measures combustion efficiency.

  5. #4
    urbanski is offline Cadillac Owners 10000+ Posts
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    Re: O2 Sensor

    call lindsay cadillac for your new ones -->

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