Left rear signal works,but left rear brake light fails to come on when brake is applied
1) Open trunk
2) Remove small round plastic access panel with a flat tip screw driver by prying open
3) Remove flat tip screw holding tail light assembly
4) Remove tail light assembly by pulling outward, careful not to break plastic guide/nub
5) Disconnect wiring connectors
6) Remove plastic housing access plate on back of tail light assembly by twisting/turning tabs until they click and then lift access plate from tail light assembly
7) When viewing the the bulbs, the turn signal bulb is the bottom left bulb
8) Install in reverse order, ensuring tail light seal seats properly during installation
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: LEFT BRAKE LIGHT AND TURN SIGNAL LIGHT INDICATOR
Replace both sides with correct dual element bulbs which may be the culprit here
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: Cold Weather causing the Left Rear Brake light to come on
That's the most interesting problem I've heard all week. I'm pretty sure this has to be problem in the switch that operates the light. Are you positive it's the brake light and not just the tail light? Tail light switch is part of the headlight switch. If you're sure it's the brake light, replace the switch under the brake pedal arm, under your dash. I think this is the problem because unless the circuit is engaged at these switches, it's impossible to activate them from anywhere else. Brake switch is easy. You can do it your self. Headlight switch usually involves removing the steering wheel and is kind of a pain but not too overwhelming.
SOURCE: 2005 audi A6 intermittent tail light failure
I can't solve this problem, but have had the entire left tail light unit on a 2005 A6 replaced under warranty 5 times in 3 years. Once it was out of warranty, the dealer kept replacing bulbs and charging me $30 each, but it never solved the problem, even for a day (clearly looking to duck their lifetime guarantee on work they did).
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