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Thread: P112F guestion for N55 F10

  1. #1
    Join Date
    May 2015
    Location
    Virginia
    Posts
    41
    My Cars
    2011 535i

    P112F guestion for N55 F10

    After getting reacquainted with this code, I have cleaned both MAP sensors, removed and cleaned the intercooler [very oily], and ensured that the oil filler cap is well sealed. A Google search revealed this simple suggestion from a 'CCA member:

    Couple things can cause this one, the start of the death of a high pressure fuel pump. Try this first unplug the tank vent valve and let the vehicle idle for 15 mins and plug it back and clear the faults. This will reset the DME adaptations and if the fault stays away its fixed. If it returns the high pressure fuel pump might be the issue and need to be looked into.

    Can idling for 15 minutes with the tank vent valve disconnected cause any harm? I assume that the potential upside is that this protocol will give the computer a new baseline from which to quantify the relationship between throttle position and boost pressure.

    Comments, suggestions, pithy wit?

    tia, dirtup

  2. #2
    Join Date
    May 2015
    Location
    Virginia
    Posts
    41
    My Cars
    2011 535i
    Fortunately, this turned out to be a false alarm: when removing covers to scope out the fuel tank vent, I discovered that the CCV hose had popped out of the intake tube just downstream of the MAF. Popped it back in [tightly this time!] - no more CEL.
    Wish they were all this easy,
    dirtup

  3. #3
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    12,459
    My Cars
    36 Cylinders
    Glad it's solved.
    Often you'll get a much better code and description if you use BMW oriented scanner that reads BMW codes. There can be many BMW specific codes assigned to one vague P code.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

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