Audi A4 2020 Bulb Size
Bulb size chart
This 2020 Audi A4 bulb size page is designed to help you verify the correct bulb type by lighting position, so you can match the right part before you buy. Because Audi used different lighting setups depending on trim, package, and market, the bulb list for this model can vary between LED, HID, and other configurations.
Use the chart on this page to identify exterior and interior bulbs such as the brake light, license plate light, reverse light, dome light, map light, and headlight bulbs. Checking by location is the easiest way to avoid ordering the wrong replacement for your 2020 Audi A4.
Fitment on the 2020 Audi A4 can change with trim level, lighting package, body style, and regional equipment, so always compare your vehicle’s current setup with the chart before purchasing. Some A4s use factory LED lighting in many positions, while others may have halogen or HID headlight systems, and those differences affect the correct bulb choice. If you are considering an aftermarket LED conversion, make sure the bulb base, size, and electrical compatibility match the housing and that the new bulb will not trigger warning messages or fitment issues. The safest approach is to check the installed bulb or the original housing markings first, then confirm the replacement before ordering.
FAQ
What bulbs does the 2020 Audi A4 use for the brake lights?
The listed brake light bulb for the 2020 Audi A4 is LED, with P21W noted for some applications. Always confirm the exact rear lamp setup on your car before ordering.
Does the 2020 Audi A4 use LED headlights?
Some 2020 Audi A4 models use LED headlights, and the page lists LED headlight-related bulbs for those versions. Other trims may use HID headlights, so the correct bulb depends on your equipment.
What is the low beam bulb for a 2020 Audi A4 with HID headlights?
For A4 models with HID headlights, the headlight bulb high beam and low beam is listed as D5S. This applies only to the HID-equipped setup.
What bulb is used for the high beam on a 2020 Audi A4 with halogen-style headlight equipment?
The page lists H16 LED and H8 LED for the high beam bulb on certain 2020 Audi A4 configurations. Check your headlight housing and installed bulb to confirm which version you need.
What bulb fits the front turn signal on a 2020 Audi A4?
Front turn signal fitment depends on the headlight type. With LED headlights, the front turn signal is listed as LED, while with HID headlights it is listed as 64132.
What bulb does the rear turn signal use on the 2020 Audi A4?
The rear turn signal bulb is listed as LED, PY21W for the 2020 Audi A4. This is a useful reference when replacing the rear lamp assembly bulb.
What is the reverse light bulb for the 2020 Audi A4?
The page lists a back up reverse light bulb as LED, and also shows a back up light bulb as 921 for certain applications. Because trim and lamp design can vary, verify the exact rear lamp before purchase.
Are the license plate lights on the 2020 Audi A4 LED?
Yes, the license plate light bulb is listed as LED for the 2020 Audi A4. This is one of the simpler bulbs to confirm by location.
What interior bulbs are listed for the 2020 Audi A4?
Interior bulb positions listed on this page include vanity mirror light, trunk or cargo area light, dome light, map light, interior door light, stepwell light, and glove box light. The glove box light bulb is listed as 2821.
What bulb is used for the tail lights on the 2020 Audi A4?
The page lists the tail light bulb as LED, P21W, and also shows a tail light inner bulb as 921 for some configurations. Because rear lighting can differ by market and body style, confirm the exact lamp position.
Does trim or package affect bulb fitment on the 2020 Audi A4?
Yes. Trim, lighting package, body style, and market can all change bulb fitment on the 2020 Audi A4. The same model year may use different bulbs in different lighting systems.
Should I check the installed bulb before buying a replacement?
Yes, that is the best way to avoid mistakes. Even when a bulb size is listed for the 2020 Audi A4, checking the installed bulb or the housing label helps confirm the exact match before you order.