The 2015 Audi S3 uses either D3S or LED lighting for the low- and high-beam headlights, depending on the installed headlight configuration. Check whether the vehicle has HID or LED headlights before ordering, since the headlight bulb type is not the same across all versions.
For equipped vehicles, the fog light uses a 64136 bulb. Front turn signal fitment also varies by headlight type: vehicles with HID headlights use 64132, while vehicles with LED headlights use an LED unit.
Most other exterior lighting is LED, including the brake, center stop, cornering, daytime running, license plate, parking, tail, and rear turn signal lights. The reverse light uses 64132. Interior dome, glove box, general interior, and trunk lighting may use either 2825 or 98, while the vanity light uses 6418. Verify the existing bulb and headlight equipment when multiple options are listed.