Applies to Audi A4s: with halogen rear lights (saloon models)
The description for changing the bulb refers to the left rear light unit; in principle the same procedure applies to the right rear light unit.
Check which of the bulbs is defective.
Open the boot lid.
Take the screwdriver out of the Audi A4 tool kit.
Using the flat-blade side of the reversible screwdriver insert, carefully detach the cover cap Fig. 1 -arrows-.
Slacken the screw on the bulb carrier and remove the bulb carrier from the light unit.
Unplug the electrical connector.
Change the bulb Link.