I have a 2004 V10 Touareg which has intermittent turbo failure, resulting in the car going into limp mode. It's seems everyone with a V10 has the pleasure of this problem!
The current scans show:
1 fault present
16562 ( P0178 ) Fuel composition sensor circuit
ENGINE ELECTRONICS 2
1 fault present
18361 ( P1953 ) Turbocharger ECU 2
The previous scans on many occasions show:
Number: P195300 (P1953): Turbocharger (TC) control module 2 Faulty
Error Type 1: TBD
Error Type 2: Intermittent
What is the diff between the ECU fault and the control module fault?
The limp mode happens more frequently when the car in under load, or going uphill, but can happen anywhere. It is becoming more and more frequent. It will either not go above 80km/hr with my foot on the floor, or goes into full blown limp mode and won't go over 20km/hr. If I turn the engine off, and restart the car, the problem is fixed. I get no warning lights on the dash.
Recent work to the car include (due to other issues):
Car injection flush
Clean quantity control valve
2 new batteries
Clean of wiring and connectors (I think under front seat)
New vacuum pump (due to oil leak)
2 new fuel sender units
In the past I have had the turbo looked at. They disconnected the rods to find that they move freely. The actuator was found to be stiff, binding and noisy. The linkages were lubricated, with little improvement in performance.
Before contemplating removing the engine, I am thinking about getting the actuator rebuilt by these people ECU Testing in the UK:
VW Touareg TDI Turbo Actuator Fault
Has anyone had this rebuild done and solved their limp mode???
What other things should be looked at other than the C-clip and the actuator pin?