For the 2016 Audi A4, the supplied fitment data lists D3S bulbs for both the low-beam and high-beam headlights. This means the same D3S bulb type is specified for both headlight functions. No fog-light bulb fitment is listed in the available data.
Other notable exterior lighting includes a 64132 bulb for the front turn signal and a 921 bulb for the reverse light. The brake lights, center stop light, daytime running lights, license plate lights, parking lights, front and rear side markers, step light, tail lights, and rear turn signals are listed as LED.
- Headlights: D3S low beam and D3S high beam
- Front turn signal: 64132
- Reverse light: 921
- Interior lighting: dome light uses 6411 or 6428; glove box, interior, map, and trunk lights use 2825 or 98
- Vanity light: 6418
The supplied data does not identify separate fitments by projector or non-projector headlight configuration, so verify the installed housing before ordering.