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Rough running A4 1.9 TDI AHU

stevojam Apr 19, 2012

  1. stevojam

    stevojam New Member

    Hi all,
    Having some problems with my A4 1.9 tdi, 1999, 189k.
    When I try to start the car the Glow Plug Light only comes on the odd time after turning the key a good few times, if there's no light the car won't start and when the lights on it starts then after a few minutes it has a rough idle issue.
    Had the car scanned with Vag Com and it showed up these issues

    18062-Please check DTC Memory of instrument cluster
    P1654-35-10- - Intermittent

    17964-Charge Pressure Control
    P1556-35-00- Negative Deviation

    17552-Mass Air Flow Sensor (G70)
    P1144-35-10-Open or short to ground - intermittent

    18027-Glow Plug Relay (J52)
    P1619-35-10-Open or short to ground - intermittent

    So I replaced the Mass air flow sensor, Glow plug relay (Mine was relay number 219 not 109) and had the errors cleared. Then tried to start the car but still no glow plug light until a few turns of key then it would start and after a few minutes the rough idle was back again.
    Scanned car again and its now showing 1 issue:

    01314- Engine Control Module
    49-10- No Communication.

    Any help would be great as I'am starting to lose faith.
  2. Bradderz_1988

    Bradderz_1988 Dont replace it, Upgrade it !!

    IIRC this has been posted before and i think the ecu is the cause of this problem but i may be wrong, i tend to stay away from the derv's lol only petrol runs in my blood.
  3. stevojam

    stevojam New Member

    Hi Bradderz_1988. Think it could be the ecu, going to do few more checks then maybe order a secondhand one and get it coded to the car.


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