P0171-p0174
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Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, P0171-p0174 in Cadillac SRX Forums; Recent DTC in stored and pending. MIL came on P0171 system too lean bank 1 P0174 system too lean bank ...
  1. #1
    orandaberg is offline Cadillac Owners Connoisseur
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    P0171-p0174

    Recent DTC in stored and pending. MIL came on
    P0171 system too lean bank 1
    P0174 system too lean bank 2

    Could this be because I installed VT mufflers? Also I have now the madtuner flash so I will be updating my ECM.
    Could the new flash eliminate this? If not the new mufflers what else could cause the DTC. I was driving on the autobahn in Germany.

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  3. #2
    repnatl is offline Cadillac Owners Enthusiast
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    Bank one and two lean together I'd suspect the mass air flow sensor

  4. #3
    orandaberg is offline Cadillac Owners Connoisseur
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    Re: P0171-p0174

    So if I get these same DTC in the future, I can pretty much assume the sensor is out? Would I not get a DTC for that?

  5. #4
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Northstar?


    Check the intake manifold bolts. Common problem.

  6. #5
    orandaberg is offline Cadillac Owners Connoisseur
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    Re: P0171-p0174

    Yes Northstar

  7. #6
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: P0171-p0174

    Yeah, loose intake manifold or any other source of extra air (after the Mass Airflow Sensor) will cause both banks lean
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  8. #7
    orandaberg is offline Cadillac Owners Connoisseur
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    Re: P0171-p0174

    Whats the N/m for the bolts?
    Answer 10 N·m
    89 lb in

  9. #8
    repnatl is offline Cadillac Owners Enthusiast
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    There are codes for the mass air but typically I look at that with any dual banks being lean but also they are right the v8 had issues with intake bolts backing out some blue loctite will fix that

  10. #9
    orandaberg is offline Cadillac Owners Connoisseur
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    Re: P0171-p0174

    Anyone know the correct head size for the bolts, I used a 10mm but I think it a special head?

  11. #10
    repnatl is offline Cadillac Owners Enthusiast
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    13mm?

  12. #11
    orandaberg is offline Cadillac Owners Connoisseur
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    Re: P0171-p0174

    no thats too high, its 10 but the head of the bolt is not your typical socket head

  13. #12
    orandaberg is offline Cadillac Owners Connoisseur
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    Re: P0171-p0174

    Anyone know the head bolt pattern? MM or US? I am not at home to try and would just like to know if possible before, so when I get home I can just buy ther tool and not have to remove one then compare. I used a 10 mm and to tighten some loose ones but slips off when trying to torque it dowm to 10N-m so it could be US or a different head pattern.

  14. #13
    RippyPartsDept's Avatar
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    Re: P0171-p0174

    sounds like a service manual would be a really really good investment for you

    found a set on ebay for $280 ... i think the new set from the publisher (Helm Inc) costs less than that
    check http://www.helminc.com
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
    Rippy is a Cadillac, Hummer, Saturn & Saab dealership & Official Saab Service Center
    ~~ Family owned and operated in Wilmington, NC since 1946 ~~
    We offer all forum members discounts on parts and freight
    phone: 800-RIPPY-22
    <-- insert standard boilerplate about posts not necessarily representing my employer, etc -->

  15. #14
    orandaberg is offline Cadillac Owners Connoisseur
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    Re: P0171-p0174

    The bolt pattern is not in the manual or the size, just the torque.

  16. #15
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: P0171-p0174

    i find that hard to believe
    you have a factory manual?
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
    Rippy is a Cadillac, Hummer, Saturn & Saab dealership & Official Saab Service Center
    ~~ Family owned and operated in Wilmington, NC since 1946 ~~
    We offer all forum members discounts on parts and freight
    phone: 800-RIPPY-22
    <-- insert standard boilerplate about posts not necessarily representing my employer, etc -->

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