Fair advice above, but the VAG diagnostic system is not infallible and won't detect some faults. This one may apply and some knowledge of standard faults is always useful.
I would suggest changing the brake lamp switch above the pedal - even if the lamps are functioning normally. Faulty switches are very common and can cause all sorts of problems with glow plug and brake warning lamps and also cruise drop-out etc.
This is because the switch is actually a double switch - one half for the lamps and the other for the engine ECU. If one half fails, the cross-check for operation in the ECU is not satisfied, and the warning lamps appear. This fault does not always leave a code set. The double switch is actually a good idea as the engine power will be cut if you try to accelerate and brake at the same time. It effectively prevents a "Toyota moment".
The switches are cheap (try GSF) and fitting is easy - but take advice as to the fitting method as the switch has been re-designed a number of times.
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