O2 Sensor

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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, O2 Sensor in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I have the dreaded check engine light. I pulled the codes and I have P0158 Mod$11 O2 Sensor Circuit High ...
  1. #1
    SJC is offline Cadillac Owners Member
    Automobile(s): Cadillac CTS
    Join Date
    Sep 2007
    Southern MD

    QuestionO2 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.

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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
    Join Date
    Jul 2005

    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
    Automobile(s): 2003 CTS Manual Trans., '93 STS
    Join Date
    May 2004
    Yorktown, VA

    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.

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  6. #4
    urbanski is offline Cadillac Owners 10000+ Posts
    Automobile(s): 05 CTS-V
    Join Date
    Mar 2003
    San 'tone, TX

    Re: O2 Sensor

    call lindsay cadillac for your new ones -->

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