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Thread: Service Engine Soon!

  1. #1
    ej2000n's Avatar
    ej2000n is offline Cadillac Owners Fanatic
    Automobile(s): 2007 STS
    Join Date
    Sep 2005

    Service Engine Soon!

    Today I was at the redlight and just happened to notice that my service engine light had came on. I pulled the codes a minute ago and got these:

    PCM 0151 heated O2 sensor circuit low voltage bank 2 sensor 1
    PCM 0174 Fuel Trim system lean bank 2
    PCM 1139 Heated O2 sensor insuff. switching bank 1 sensor 2

    This makes sense to a point but performance wise I have no idea what they mean and what caused the codes to appear. Is this major or something that can be corrected. I'll wait for a response before I clear them.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Service Engine Soon!

    Sounds like 2 sensors failed causing P0174 would be my guess. Bank 2 Sensor 1 is on the front manifold. Bank 1 Sensor 2 is the pre-cat sensor. See if anyone agrees with me.

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