For the 2007 Audi A3, the low-beam bulb depends on the factory headlight setup. Models with adaptive HID headlights use D1S, while other HID-equipped models use D2S. A3 models with halogen headlights use H11 for low beam. The supplied fitment data does not list a high-beam bulb, so check the original bulb before ordering for that position.
Fog-light fitment also requires comparison with the bulb currently installed: the listed options are H11 LED and H16 LED. Front turn signals may use 7507 or 2827, while the front side marker uses 2827. Rear lighting includes 7506 for the rear turn signal and 7506R for both the brake and tail lights. The reverse light uses 921, and the center stop lamp is listed as LED.
- License plate and courtesy lights: 6418
- Dome light: 6411 or 6428
- Parking, glove-box, and trunk lights: 2825 or 98
- Map light: 64111