Audi A4 Self-help Fuses and bulbs Bulbs
Applies to: vehicles with bulbs
Fig. 330 Applies to: Saloon Rear of vehicle: Overview of bulbs in side panel and boot lid
Fig. 330 
Applies to: Saloon 
Rear of vehicle: Overview of bulbs in side panel and boot lid
Fig. 331 Applies to: Avant/allroad Rear of vehicle: Overview of bulbs in side panel and boot lid
Fig. 331 
Applies to: Avant/allroad 
Rear of vehicle: Overview of bulbs in side panel and boot lid
You must only replace a bulb with a bulb of the same type. Information regarding e.g. the wattage can be found on the bulb.
The description for changing the bulb refers to the left rear light unit; the procedure for the right rear light unit is similar.
You can change the following bulbs:
Applies to: Saloon
Bulb (12 V)
Version
-1- Brake light/tail light
P21W
-2- Brake light/tail light
P21W
-3- Tail light
W16W
-4- Rear fog light1)
H21W LL HTR
-5- Turn signal
PY21W
-6- Reversing light
W16W
Applies to: Avant/allroad
Bulb (12 V)
Version
-1- Brake light/tail light
W16W
-2- Brake light/tail light
W16W
-3- Tail light
W16W
-4- Rear fog light1)
H21W
-5- Turn signal
PY21W
-6- Reversing light
W16W