Wondering if someone could help. I have a mate with an Audi A3 2.0 TDI 140 and its starting having an issue on long journeys only.
At roughly 80-90mph in 6th, the accelerator pedal goes to the floor, car slows down and uses about 50 miles of the range within a few mins. Turning the engine off and back on seems to resolve the issue until the next time.
Engine management states over boost and limph mode. They've had all the pipes etc checked.
Any clues? First thought was boost pipe.....