W205 EGR / MAF Problem

Discussion in 'Engine' started by EddieF, Dec 2, 2019.

  1. EddieF

    EddieF New Member

    Messages:
    2
    Joined:
    Feb 18, 2014
    Car:
    2015 W205 C220 Sport
    Hi,
    I have a 2015 W205 C220 Sport with 65,000 miles.
    The car went into limp mode but no warning light on dashboard (couldn't get higher than 3rd Gear or use paddles to shift)
    A friendly independent garage scanned it and came up with “P0402.00 The flow in the exhaust gas recirculation (cylinder bank 1) is too high. There is a general failure (stored)”
    There was also a stored code relating to the Mass Airflow Sensor (P0101)

    My man said he had three theories but fully booked-up for weeks -
    1. Valve in exhaust tailpipe stuck (I think this is for when it’s in SPORTS+ mode)
    2. Servo and flap in the inlet manifold stuck
    3. EGR valve faulty
    (He thinks the Mass Airflow error is a side-effect of the main problem)

    Clearing the stored codes meant the car was drivable again, but it needs looking at.
    For a few weeks prior to this I thought the engine sounded noisier than usual - sort of rasping as I accelerated from low speed. Also my MPG had dropped from a consistent 42mpg per tank to 38mpg
    The engine is bone dry - no sign of leak from injectors or turbo pipes.
    I'm booked into another independent Mercedes specialist next week.
    Does anyone have any experience or advice?
     
  2. whizzy

    whizzy New Member

    Messages:
    9
    Joined:
    Apr 8, 2017
    Car:
    Mercedes C200 Kompressor 2.0L 2005
    The most common causes of this code are clogged EGR passages and clogged DPFE sensor passages. You may also suspect a faulty EGR sensor, MAP sensor, faulty EGR valve, faulty EGR control solenoid, a broken vacuum line, or faulty electrical wiring (or connectors) as possible causes
     

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