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Thread: OBD Code 2188

  1. #1
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    Default OBD Code 2188

    Condition

    The control module receives information from the heated oxygen sensor (HO2S) about the fuel / air mixture when idling at both the lower and upper part-load range. If the fuel / air mixture deviates from lamda=1, the short-term fuel trim will compensate for this by adjusting the injection time so that lamda=1 is achieved. When the short-term fuel trim makes an adjustment, the integrator median must be adjusted by the long-term trim. Diagnostic trouble code (DTC) ECM-262A will be stored when the long-term trim must be adjusted almost to maximum in the idle range.


    Substitute value
    none


    Possible source

    Upper limit : (P2187)
    -intake air leakage
    -exhaust system air leakage
    -defective heated oxygen sensor (HO2S)
    Lower limit: (P2188)
    -intake air leakage
    -high fuel pressure
    -leaking injectors
    -defective mass air flow (MAF) sensor
    -contaminated engine oil
    -oil level too high
    -defective heated oxygen sensor (HO2S)





    - So figured it was the MAF - NOPE

    Any other suggestions
    2012 Ford Fusion 2004 V70XC 01 V70XC -M66 1998 C70 T5-M66

  2. #2
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    Ottawa, ON, Canada
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    Default

    Quote Originally Posted by Chilled Man View Post
    Any other suggestions
    Have you checked the other possible causes listed by Volvo for that code?

    • intake air leakage
    • high fuel pressure
    • leaking injectors
    • contaminated engine oil
    • oil level too high
    • defective heated oxygen sensor (HO2S)


    Are there any other symptoms beisdes the code?

    A bad O2 sensor would through off the AFR, which your ECU would try to correct, thus potentially giving you the code if the long-term trim must be adjusted almost to maximum in the idle range.

    Check the easy (cheap) ones first and go from there.
    Last edited by Ars Gladius; 06-27-2011 at 10:35 AM.


  3. #3
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    Default

    intake air leakage
    high fuel pressure
    leaking injectors
    contaminated engine oil
    oil level too high
    defective heated oxygen sensor (HO2S)

    Check the intake air , didnt see anything obvious.
    Drove the car for 3 weeks no issues so doubt to high of oil level
    Contaminiated oil ehhhhh

    Maybe the FPR since that was an issue with the 04R's also.
    2012 Ford Fusion 2004 V70XC 01 V70XC -M66 1998 C70 T5-M66

  4. #4
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    How's engine oil smell? Strong gas odor?
    Smoke it... sounds like intake leak.
    These friggin things can take a long time to resolve.

  5. #5
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    Will check that out today .

    Going to swap in a differnet MAP sensor and go from there.
    2012 Ford Fusion 2004 V70XC 01 V70XC -M66 1998 C70 T5-M66

  6. #6
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    I would've also replaced the MAFS, because they work hand-in-hand with the H02S! Maybe it's the H02S? An old faulty, H02S may not necessarily throw a specific code. At the very least, if you replace this the only thing that will happen is slight increase in fuel mileage.

    usually, these things will throw a more specific code:
    oil level = you'd know, easy check
    intake leak = much harder to detect, usually a smoke test
    contaminated engine oil = another easy check
    exhaust leak = usually very easy to detect
    high fuel pressure = throw a FPR guage on it and find out?
    FPR = probably cheap enough to just replace
    leaking injector = you'd know, easy check with starter fluid

  7. #7
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    Replaced MAP Sensor .

    No more issue !
    2012 Ford Fusion 2004 V70XC 01 V70XC -M66 1998 C70 T5-M66

  8. #8
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    How do you use starter fluid to check for a leaking injector?
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  9. #9
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    What made you think to replace the MAP sensor? And it wasn't throwing a code for that which is weird.

  10. #10
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    Quote Originally Posted by 8pack View Post
    How do you use starter fluid to check for a leaking injector?
    It will (i think) speed up the revs at idle when you spray the stuff around the injector seals.

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