Open the rear hinged door.
Remove the left or right side trim.
Turn the quick release latch (arrow) on the lamp bracket to the left and remove the bracket.
There are two lamps in the bracket:
- from the outside - direction indicator;
- on the inside - brake light and rear side light.
Press the burnt-out lamp lightly into the bracket, turn it to the left and remove it.
Insert the new bulb, press it in slightly and turn it to the right until it stops.
Install the bracket and turn the quick release to the right.
The original article is posted on the resource: AudiManual