Rear lights not working

SOURCE: Audi a3 rear brake light fault

the dealer can fix this or any mechanic with a vag com interface, basically its a matter of programing the tailgate lights (both of them) to work as brake lights. the euro speck enables one of the other or both, same goes for the backup light. if you had a module replaced recently this could be the reason for the change, whoever installed it should be able to rectify this for you.

SOURCE: Left rear brake light stopped working but bulb and fuses are OK.

take the bulb back out have someone sit in car apply brake get your self a circuit tester and check to see if this circuit is carrying efficient 12 volt current! some times in cold weather these bulbs get hot with long period of breaking and when released condensate and rust begins and you get what you have perhaps bad socket! this would be a ideal location to begin and probably end,

SOURCE: Audi A6 2007 rear left light, brake light and turn signals

unplug the light. you will find a bit of rust on the + contact. that's the cause. I think it sparks sometimes and the computer shuts down the whole lamp. use a nail file or smooth sandpaper to clean the contact and there you have it... good luck. ;)

SOURCE: rear brakelights dont come on

If the high level brake light works, then the brake light circuit is fully functional.

Brake light bulbs may LOOK fine, but can still have failed. Often folks don't notice that one bulb has failed until the second one has blown; it's then easy to incorrectly assume that the fault is more complex.

Try replacing the brake light bulbs: if that doesn't work then please report back for additional options.