My 2005 Audi A6 has these intermittend problems: 1) Adaptive Lights Defective 2)Rear turn signal light 3) Rear brake light. I am just wondering if all of these are just starting to show me that there is an electrical problem, or my lightsbulbs are just burning out??

SOURCE: how do i change time on clock on 2005 audi a6 quattro s line

I think I can help you. I just did this on mine yesterday because my clock runs a few minutes fast each month. It was somewhere bizarre - sorry I'm not near the car to be more clear. I think I picked Sound, Settings and for some odd reason, it was there, rather than in Car, Settings. NOOO - it was in Tuning - click the AM/FM button, then Settings. I've only had it for a few months, but you'd think I'd have that one figured out due to re-setting it.

-maria

SOURCE: What type of oil does my 2005 A6 Audi 3.2 Quattro use?

it doesn't matter what brand you use, just make sure you use the motor weight on the cap (don't use Pennzoil)

SOURCE: Turn signals not working audi a6 2002

turn signal switch most likely. But it could have a faulty flasher relay. the signals and the hazards probably have seperate flasher relays and possibly on different circuits so check fuses as well

SOURCE: audi A6 2.4 2005 just over 100000km it need to

2.4 not such a thing. You mean 4.2 right?? You must chnage timing belt water pump and all related probably bout 1600.00 . Much cheaper that an engine rebulid work. If belts breaks vakves will bent

SOURCE: Audi A6 2005 LH Rear Turn Signal & Brake Light Failure

I had a problem with rear left side signal brake and reversing lamps not working on my 2007 A6 2.L Tdi SE.( Intermittent fault for 2 months)
I think I have identified the problem.
The seal between the Lens and the bulb plate had allowed moisture into the lamp.
During sunny days the water evaporates and enters the multi pin connector at the rear of the lamp.
On close examination of the connector I noticed minor discolouring of the ground ( Heavy Brown Wire connector Causing intermitting lamp failure )
SOLUTION
I expelled all moisture from the lamp and multi-pin connector.
I removed the neoprene seal from the lamp and refitted it good side up
I cleaned the ground pin on the connector with 600 grade paper and contact cleaner
I put a slight twist in this pin with long nose pliers so as to get better connection.
Lamp is working fine since.
Changing the bulb plate may also work
Great care must be taken when changing bulbs or this problem will reoccur