[s-cars] A6 tailight

[Bill Mahoney]

My C6 had a taillight warning issue some time ago.
I don't know how the C5's are but on the C6, I removed the tail  lamp assembly, then removed the back panel of the lamp assembly which contains all of the bulbs and the power connector.
The '07 C6 lamp assembly has a row of LEDs on the top that has power supplied by the power via this back panel.  There are two contact points within the lamp assembly that need to make contact with two metal points on the back panel in order to send power to the LED's.
Anyway, what I'm leading up to is to check and clean all the connections within the lamp assembly including removing, cleaning and reinstalling all the bulbs.
Dunno if they had it in '05, but nowadays there are computers within the car that measure current.  Any change in voltage is immediately reported to Inglestadt where they decide whether or not to turn out your tail light completely.   Not really, but they do monitor the current.
My .02
HTH
Good luck!
Bill ~ gimme an Audi that needs no work~ M