This 2020 Audi A3 bulb size guide helps you verify the correct bulbs by lighting position, so you can replace the right lamp without guesswork. Whether you are changing an exterior signal bulb or a small interior courtesy light, using the bulb chart for your exact position makes the job much easier.
The 2020 Audi A3 can use different lighting setups depending on trim, market, and body style, so it is smart to confirm the bulb type before ordering. This page lists the common bulb sizes for the A3 by location, including headlight, brake light, turn signal, dome light, map light, glove box light, and cargo area light positions.
Fitment can vary on the 2020 Audi A3 because some cars use different lighting packages, and some exterior lamps may be halogen or LED depending on trim and region. If your A3 has been modified with aftermarket lighting, or if a previous owner installed conversion parts, the bulb listed on the chart may not match what is currently in the housing. The safest approach is to check the installed bulb before buying replacements, especially for headlight and fog light positions where LED and halogen setups can differ. When in doubt, compare the old bulb’s base, shape, and connector style to the chart so you get the correct fit the first time.
