I've had an A4 Avant S line 170 for about 6 months, love the car but ...
For a few months now I have been experiencing an intermittent fault. Only seems to happen on long journeys. The glow plug warning light comes on after an hour or so of driving with a serious loss of power. Stopping the car, switching off the ignition sometimes cures the problem as it did yesterday while driving up north on the M6. Audi main dealer had the car in (again) last Tuesday and ran all the diagnostics costing me a hundred quid but couldn't find any fault. Anyone had the same problem?
