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  1. #1
    X5Tanya
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    Service Engine Soon Light On/Off HELP!!

    I have an 01 X5 4.4 and the service engine soon light came on last week and then when off after a couple of days. This has happened a couple of times, on then off. I had my car scanned with a generic scan tool and came up with a P0171 code- mixture lean. Has anyone seen this on a 4.4 and what kind of repair am I looking forward too.
    Thanks for your help- I hope this is not an old topic, so I appologize if it is.

    T


  2. #2
    Jhud
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    Re: Service Engine Soon Light On/Off HELP!!

    if its both banks then it COULD be a mass air flow sensor, if its only 1 bank then you may be sucking air or have a vacuum leak somewhere.

  3. #3
    X5Tanya
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    Re: Service Engine Soon Light On/Off HELP!!

    There was only one code but does that mean only one bank?, I dont know.

  4. #4
    X5Tanya
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    Re: Service Engine Soon Light On/Off HELP!!

    After doing a little research, I have found that the pcv hoses in the back of the engine crack- so I looked at the ones on my car and sure enough they have a hole in them. Would this cause a vac leak on these engines or does this have nothing to do with the lean mixture code?

  5. #5
    Jhud
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    Re: Service Engine Soon Light On/Off HELP!!

    Yes these will definately set lean codes on your vehicle

  6. #6
    X5Tanya
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    Re: Service Engine Soon Light On/Off HELP!!

    I replaced the 2 pcv hoses on the back of the intake and cleared the code. So we will see what happens!!
    Thanks for your input-

    T

  7. #7
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    Member No: 78710 bbachman is an unknown quantity at this point bbachman's Avatar
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    Re: Service Engine Soon Light On/Off HELP!!

    X5Tanya,
    I am having the same issue and posted a few questions.
    Hopefully you may be able to help :)

    Thanks!!

    Barry

  8. #8
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    Sounds like a vacuum leak, for sure

    If there is air bypassing the MAF, then the computer goes nuts trying to figure out the lambda ratio. Usually this results in an O2 sensor code - "oxygen sensor out of range" for banks 1 and 2.

    On my 2002 3.0 and my neightbor's 1997 2.3 this turned out to be the intake elbow accordian, which leaked. From what I have read, this is a common problem with the sixes.

    I don't know about the V-8's though. But vacuum leaks are easy to find and repair, so it is a good first place to look before replacing more expensive parts.

  9. #9
    X5Tanya
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    Re: Sounds like a vacuum leak, for sure

    Turned out to be a MAF sensor. I plugged one in 5k plus miles ago and still no light. Thanks for all your input!!

  10. #10
    Gabe
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    Re: Sounds like a vacuum leak, for sure

    I have the same problem with SES light on. Could you direct me where exactly the pcv hoses are located? Thansk much.

  11. #11
    robertplattbell
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    Get a code reader or get the code read.

    First get a code reader (peake) and find out what error codes you have. If you are that desperate for money (you own a BMW?) go to autozone and have them read the code for free.

    If it says something about oxygen sensor out of range, it may be a vacuum leak.

    The link below shows how to fix the intake elbow leak on a 3.0. I don't know what engine you have or if that is even relevant.

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