For the 2013 Audi A6, headlight bulb fitment depends on the installed headlight system. The low beam uses D3S or LED. High-beam options include D3S, H15 with halogen headlights, or LED with LED headlights. Halogen-equipped models also use H15 for daytime running lights, while LED-equipped models use LED.
Front turn signals use 7507 with halogen headlights and LED with LED headlights. The parking light may use 2825 or 98 on halogen-equipped vehicles, or LED with LED headlights. Fog-light listings include H11 LED, H16 LED, and 64136, so verify the existing fog-lamp setup before ordering.
Reverse lights use 921. Brake and tail lights use 7506R with halogen headlights and LED with LED headlights, while rear turn signals use 7507 or LED under the same headlight-based distinction. Center stop, cornering, side-marker, license-plate, and step lights are listed as LED.
Interior applications include 2825 or 98 for courtesy, glove-box, interior, and trunk lights; dome lights use 6411 or 6428, the map light uses 6486X, and the vanity light uses 6418.