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Thread: N47D20C - Fuel Pressure Fault

  1. #1
    Join Date
    Jan 2019
    Location
    Ireland
    Posts
    1
    My Cars
    120d E82 2007

    N47D20C - Fuel Pressure Fault

    Hello everyone, I am new to this forum.

    I have a E82 N47D20C engined car that is consistantly going into limp mode with an EML displayed. Upon scanning I am getting the following codes. "Rail Pressure Monitoring, delivery deviation", "Fuel Pressure control" & "Rail Pressure Monitoring, Delivery Deviation".

    At a steady speed, the car can be felt pulsing up and down. This can be veiwed in the live data showing rail pressure, a spike in pressure is felt as a jolt of acceleration. The car will go into limp mode and sometimes die altogether.

    So far, I have - changed the rail pressure sensor and fuel filter. I cut open the old fuel pressure and checked inside the fuel rail - no filings have been observed which to me suggests the HPFP may still be healthy.

    The car still has full power when not in limp mode and is driving well.

    Has anyone had similar problems?

  2. #2
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,934
    My Cars
    2018 BMW M240i
    It could be the fuel pump.

  3. #3
    Join Date
    Jan 2018
    Location
    Morocco
    Posts
    1
    My Cars
    MaxwellVEXXM

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