Audi TT Daytime Running Light Bulb Size
The Audi TT daytime running light requires a bulb size of P21W for the lighting system. Data for the specified component covers the range from 2008 to 2009.
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 |
|---|---|
| 2008-2010 | P21W (With HID Headlamps) |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W |