Audi A4 Tail Light Bulb Size
The Audi A4 tail light bulb sizes include 921, P21W, 7506, and 1157 configurations for inner, outer, and standard tail light applications. A replacement chart documents bulb size specifications across 1996 to 2020 vehicle production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
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Inner Tail Light
Years US Type EU Type Shop
2020 921 W16W Check Price 2019 921 (Without special body measures, Taillight assemblies, standard design) W16W Check Price
Outer Tail Light
Years US Type EU Type Shop
2020 1156 P21W Check Price 2019 1156 (Without special body measures, Taillight assemblies, standard design) P21W Check Price
Tail Light
If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.
Bulb Specifications
Description
Type
Shop
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W. 921 Check Price ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. P21W Check Price ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. 1156 Check Price ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W. 1157 Check Price ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W. P21/5W Check Price