A good place to start is the brake light switch.
There are 2 circuits in there: 1 for the brake lights and the other for the car computer (ESP, Engine brake etc...)
If the brake switch has an intermittent fault, the EPS light may come on and the car may run rough until you stop the vehicle and remove the key. It then re-set itself until the next time you are using the brakes and the fault appears again.
SOURCE: I have a 03 Audi A6 Quattro with the ESP & ABS light on
It's probably your brake check switch going bad, it's under the driver's side dash above the brake pedal. I had the same problem and eventually my cruise control and brake lights stopped working when it failed completely. This is also a redesigned part that you can get from the dealer for about $8, which to me indicates they new the part caused problems and failed to notify owners. Try that before Audit tries telling you wires are faulty.
SOURCE: HI , Where is the fuse box on a 2006 Audi A6 ?
In the 2006 A6 (Quattro) model it is in the trunk behind a panel on the right side
SOURCE: How To Change Rear Brake Pads on Audi A6 2006
Remove the tires, Remove the calaper bolts, (small heads on them 12mm or so) Remove calaper, Pads are setting in a holder. Lube new pads with litheum grease and place in holder. (look at old pads, one or both may have small metel tab on one end) If the new pads have the tab, put that pad where the old pad with the tab was. (ie. tab to the inside) Press pistion in with a 'C' clamp. If it won't go in easly, it may screw in. If the parking brake cable is hooked to the calaper, it probly screws in. Use large pliers to screw in calaper piston. Place calaper over pads and install bolts (lube bolts) Rember to pump brakes befor driving . to get a solid peddle.
SOURCE: Unmute Speakers on 2006 Audi A6
b0z84p2...
I've been having this problem also. I took it to the dealer and they had to load a new update for the mmi system. Luckily mine is covered under warranty.
The other solution is to turn the car off and disconect the car battery for 10 minutes-and then the mmi will reset itself. The problem, however, is that the issue will probably happen again.
SOURCE: I need my check engine light to turn off in my 2002 Audi A6
You need to have the car scanned to address the issue that is causing the check engine light to come on. The computer will reset the check engine light once the issue has been addressed and there is not more issues. The scanner can also reset the light but if the problem is still there the light will just come on again. Good luck and hope this helps, Auto Zone scan free of charge.
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