For the 2021 Audi Q7, headlight bulb fitment depends on the factory headlight system. Models with HID headlights use D5S bulbs for both the low beam and high beam. Models with LED headlights use LED lighting for the low and high beams. The fitment data also lists LED for the low beam and high beam, so verify the headlamp type before ordering a replacement.
Front turn signals are 64132 with HID headlights and LED with LED headlights. The fog lights and reverse lights use 921 bulbs. Most other exterior lighting is LED, including the brake lights, center stop light, tail lights, rear turn signals, daytime running lights, cornering lights, license plate lights, front side markers, step lights, and vanity and trunk lights. The rear side marker uses a 2821 bulb. Interior fitment includes 2825 and 98 bulbs, while the dome, map, glove box, and other listed interior lamps are LED.