W205 EGR / MAF Problem

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

  1. EddieF

    EddieF New Member

    Feb 18, 2014
    2015 W205 C220 Sport
    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

    Apr 8, 2017
    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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