Audi S4 Tail Light Bulb Size
The Audi S4 inner tail light uses a 921 bulb size, while outer tail light and general tail light applications accommodate 921, 7506, and 12821 bulb sizes. The replacement chart covers vehicle production years from 1992 to 2024 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Inner Tail Light
| Years | US Type | EU Type | Shop |
|---|---|---|---|
| 2023-2024 | 921 | W16W | Check Price |
| 2020 | 921 | W16W | Check Price |
| 2019 | 921 (Without special body measures, Taillight assemblies, standard design) | W16W | Check Price |
Outer 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.
| Years | US Type | EU Type | Shop |
|---|---|---|---|
| 2024 | 921 | W16W | Check Price |
| 2023 | 7506 | 7506 | Check Price |
| 2020 | 7506 | 7506 | Check Price |
| 2019 | 7506 (Without special body measures, Taillight assemblies, standard design) | 7506 | 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.
| Years | US Type | EU Type | Shop |
|---|---|---|---|
| 2021 | 921 | W16W | Check Price |
| 2018 | 921 | W16W | Check Price |
| 2013-2015 | 921 (For Vehicle With LED Taillights) | W16W | Check Price |
| 2009-2012 | 7506 | 7506 | Check Price |
| 2007-2008 | 12821 | 12821 | Check Price |
| 2000 | 1157 | P21/5W | Check Price |
| 1994 | 12821 | 12821 | Check Price |
| 1993 | 1157 | P21/5W | Check Price |
| 1992 | 12821 | 12821 | Check Price |
Bulb Specifications
| Description | Type | Shop |
|---|---|---|
| ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W. | 921 | Check Price |
| Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W. | 12821 | 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 |