A3 8P (2003–2012)  Bulb Sizes

Front exterior lights

Position
Headlight (low beam)
D1S
D3S
H7
D2S
Headlight (high beam)
H7
D1S
D3S
Parking light
W5W
PS19W
Fog light
H11
H7
Front indicator (turn) signal
PY21W
Side direction indicator
WY5W
Daytime running light
P21W
PS19W

Rear exterior lights

Position
Rear indicator (turn) signal
PY21W
Tail light
R10W
P21W
Brake light
W16W
P21W
Back-up light
P21W
W16W
Rear fog light
H21W
P21W
License plate light
C5W

Interior lights

Position
Interior light
C10W
C5W
W5W
Door light
W3W
W5W
Door safety light
W3W
Boot light
W5W
Entry light
W5W
Footwell light
W5W
Reading light
T4W
W5W
Glove compartment light
W5W

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