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Overboost problem - advice needed after searching please!

Pops848 Oct 29, 2012

  1. Pops848

    Pops848 Active Member

    Hey all,

    So I've had my 2006 A3 2.0 TDI DSG since August. It was serviced before pickup with water pump, cam belt kit and oil change. After purchase it went into limp mode. The following fault codes appeared
    17507 (Glow plug)
    17506 (Glow plug)
    19559 (Manifold flap)
    16618 (Overboost)

    The manifold flap was replaced with a new part (Part number S038128063L) along with 4 glow plugs. Fault codes cleared and road test performed. No problems.

    I've since done 4,000 miles and when I was on the motorway the other day it went into limp mode. First chance I got I went and got it fault coded as the emissions light came on and it kept going into limp mode after restarting. Only fault code thrown up was 16618 (Overboost). This was cleared and the emissions light went out. I will take it on the motorway later and see if it overboosts again but I get the feeling it will.

    Now I know this could be down to one of the following

    • Hoses incorrectly connected, disconnected, blocked or leaking
    • Boost Pressure Control Valve (N75) faulty
    • Boost Pressure Sensor (G13) faulty
    • Turbo Charger stuck/faulty

    I'm going to check for any boost leaks etc first, but has anyone got any idea of any other issues this could be caused by? I'd also want to try and replace items in a cost order as a new turbo is over £900 for the unit alone. Have people had more luck replacing the N75 or G13 components before a new turbo or am I looking at a turbo replacement?

    Car has 110k on it and has got decent service history.
  2. MrLapou

    MrLapou Well-Known Member

    Likely sticky turbo vanes. Can be dis-assembled and cleaned.
    Read a thread somewhere with good description and pics. May have been for a 2.0TFSI petrol engine, but principles are the same.
    mikex709 likes this.
  3. mike foster

    mike foster Fossie VCDS Map User

    BKD engine - turbo vanes sticking. If it makes a police siren type noise on acceleration then turbo is goosed.
  4. Pops848

    Pops848 Active Member

    No siren noise under load when accelerating.
    ive read the sticky turbo vane thread along with other stories of sticky vanes. Just wondering if anyone has tried other remedies that worked or if it ALWAYS the turbo

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