For the 2017 Audi S3, both the low-beam and high-beam headlights use integrated LED lighting. The supplied fitment data does not list a replaceable halogen or HID headlight bulb, and no headlight-type variation is specified.
The exterior lighting is also listed as LED, including the front turn signals, daytime running lights, cornering lights, parking lights, front and rear side markers, tail lights, rear turn signals, brake lights, center stop light, reverse lights, and license plate lights. No fog-light bulb fitment is provided.
For the interior, the dome, glove-box, map, general interior, and trunk lights are listed with bulb options 2825 and 98. The vanity light uses a 6418 bulb. Confirm the existing lamp and socket before ordering, especially where two interior bulb options are listed.