P0171 code
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, P0171 code in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; So after fighting this code off finally a month ago. Yesterday it reappeared then went away later in the evening. ...
  1. #1
    arogers260's Avatar
    arogers260 is offline Cadillac Owners Enthusiast
    Automobile(s): 2003 CTS Luxury/Sport package
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    P0171 code

    So after fighting this code off finally a month ago. Yesterday it reappeared then went away later in the evening. Anyone have any guesses on this issue. I have new Maf sensor air filter new 02 sensors and no vacuum leak.

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  3. #2
    CTSUK's Avatar
    CTSUK is offline Cadillac Owners Enthusiast
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    Re: P0171 code

    worth checking for a small exhaust gas leak on your exhaust on bank 1 side between the sensors, also worth having injectors cleaned.
    when was last time fuel filter was done?

    Stu

  4. #3
    arogers260's Avatar
    arogers260 is offline Cadillac Owners Enthusiast
    Automobile(s): 2003 CTS Luxury/Sport package
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    Fuel filter not sure not since I've owned it been a year now and I had the injectors cleaned a few months ago along with throttle body.

  5. #4
    CTSUK's Avatar
    CTSUK is offline Cadillac Owners Enthusiast
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    Re: P0171 code

    Id go with a new filter and see how it goes

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