My A6 avant 50tdi mhev has broken down again, in at audi dealer.
They are saying the none charging of the 48v system is down to the brake boost sensor causing the alternator to go into free wheeling mode. Anyone had this as this is the second time the 48v alternator has failed 1st time costing me 4k to get it fixed (even when now these systems are warranted for 7 years).
The exact same thing happened and is now in at a dealership who are saying it's the brake booster sensor with new information from Audi Germany.
Has this happened to anyone else car is 6 years old and on its second alternator and now I am sure needs another