Berre

My TT went into the workshop for minor body repair. They disconnected the battery and when I picked up the car the date and time was completely wrong. A few hours later it was back on the right track. I suppose the clock synchronizes itself with some sort of antenna.

garyc

I had hi fi upgrade in S4. work shop disconnected battery. Hit red line a day later on way home late at night and epc light came on. Car would not rev beyond 2500 (get home mode) called Audi helpline, took it in next day to dealer who read the error logs, saw disconnect history and reset system. I don't know if tt is same. I havn't had battery out on mine, but I would not be surprised as it is to save any engine damage.