I have a 100K mile A6 Avant SE 1.9TDI (115) and all of a sudden tonight it has absolutely no power, to the extent that a small hill close by that you could normally expect to be well over the legal limit by the top off the car would not even make 40 mph up it.

There are no faults displayed, and the display says all OK, but there is obviously no turbo power, theres no smoke from the exhaust, no black, blue or white.
[img]/ubbthreads/images/graemlins/mad.gif[/img]

Any clues. [img]/ubbthreads/images/graemlins/confused.gif[/img]