Just thought Id post in case anyone can help, the forum seems a bit bare these days for A8 people.
Started my car up (A8 4.0 TDI 04 Plate) and the heat plug coil light started flashing and the yellow engine light stayed on.
I seem to be running on reduced power but the engine sounds and runs fine.
Is my only option to take this into audi to have look at and to diagnose? Ive read lots about a MAF sensor, is it worth getting that swapped out or cleaned if its possible to do? any help appreciated.