Audi A4 Daytime Running Light Bulb Size
The Audi A4 daytime running light requires bulb sizes 12278, 12277, and P21W depending on the specific version of the vehicle. Data for the provided specifications covers the range from 2007 to 2014.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Bulb Size by Year Range
| Years | Bulb Size |
|---|---|
| 2013-2014 | 12278 (With Halogen Capsule Headlamps) |
| 2009-2012 | 12277 (With Halogen Capsule Headlamps) |
| 2007-2008 | P21W |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| Philips part number. Single-filament halogen bulb with PG18.5d-3 base. 12V, 26W. | 12278 |
| Philips part number. Single-filament halogen bulb with PG18.5d-1 base. 12V, 13W. | 12277 |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W |