Audi A4 2020 Bulb Size

Bulb size chart

Fog Light Bulb Rear - H21W
Headlight Bulb High Beam - H16 LED, H8 LED
Headlight Bulb High Beam and Low Beam(with HID headlights) - D5S
Headlight Bulb High Beam and Low Beam(with LED headlights) - LED
Back Up Light Bulb - 921
Back Up Reverse Light Bulb - LED
Brake Light Bulb - LED, P21W
Center High Mount Stop Light Bulb - LED
Cornering Light Bulb - LED
Daytime Running Light Bulb - LED
License Plate Light Bulb - LED
Parking Light Bulb - LED
Side Marker Light Bulb Front - LED
Side Marker Light Bulb Rear - LED
Stepwell Light Bulb - LED
Tail Light Bulb - LED, P21W
Tail Light Bulb Inner - 921
Turn Signal Light Bulb Front(with HID headlights) - 64132
Turn Signal Light Bulb Front(with LED headlights) - LED
Turn Signal Light Bulb Rear - LED, PY21W
Dome Light Bulb - LED
Glove Box Light Bulb - 2821
Interior Door Light Bulb - LED
Map Light Bulb - LED
Trunk or Cargo Area Light - LED
Vanity Mirror Light Bulb - LED

H21W Bulbs

Used for: Fog Light Bulb Rear

View all 6 replacement options for size H21W →

H16 LED Bulbs

Used for: Headlight Bulb High Beam

View all 5 replacement options for size H16 LED →

H8 LED Bulbs

Used for: Headlight Bulb High Beam

Sealight L2 Series

Sealight L2 Series

Prevents blinding on-coming vehicles: these light bulbs utilize the super high quality and most modern technology LED chips. This technology helps you get a LED array similar to the filament inside of an original halogen bulb. This creates a nice cut line on top of the beam. No pain in replacing bulbs often: a maximum level of heat dissipation is achieved when they are in use thanks to the ball-bearing cooling fan, the copper thermal heat sink, and the high-density aluminum body, ensuring up to 50,000 hrs lifespan.

$27.94

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View all 4 replacement options for size H8 LED →

D5S Bulbs

Used for: Headlight Bulb High Beam and Low Beam(with HID headlights)

Philips D5S Standard Authentic Xenon

Philips D5S Standard Authentic Xenon

POWERFUL LIGHT FROM XENON HID BULBS OFFER MAXIMUM SAFETY: Xenon HID (High Intensity Discharge) headlight bulbs offer twice as much light* for safer driving in all conditions while consuming 50% less power. The intense white light produced by the Xenon HID lamps is comparable to daylight. Studies have demonstrated that xenon automotive lighting helps drivers to concentrate on the road and to distinguish obstacles and road signs much faster than traditional lamps. *Compared to standard halogen bulbs

$99.00

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View all 10 replacement options for size D5S →

921 Bulbs

Used for: Back Up Light Bulb, Tail Light Bulb Inner

View all 14 replacement options for size 921 →

P21W Bulbs

Used for: Brake Light Bulb, Tail Light Bulb

View all 9 replacement options for size P21W →

64132 Bulbs

Used for: Turn Signal Light Bulb Front(with HID headlights)

VEHICODE White 64132 LED Bulbs

VEHICODE White 64132 LED Bulbs

Introducing the VEHICODE White 64132 LED Bulbs, the perfect lighting solution for a wide range of applications. With advanced features and reliable performance, these bulbs are designed to enhance your driving experience. Equipped with 5 high-power SMD-3030 LED chips, these bulbs deliver impressive brightness, producing 370 lumens per bulb. With an output wattage of 1.7W per bulb, they provide efficient lighting while conserving energy. The working voltage range of 10-30V ensures compatibility with various vehicles. Experience the crisp and vibrant illumination of the 6000K-6500K white color temperature, creating a modern and stylish look for your vehicle. These bulbs boast an exceptional lifespan of up to 30,000 hours, ensuring long-lasting reliability and reduced maintenance.

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View all 11 replacement options for size 64132 →

PY21W Bulbs

Used for: Turn Signal Light Bulb Rear

View all 8 replacement options for size PY21W →

2821 Bulbs

Used for: Glove Box Light Bulb

WLJH 6000K White 2821 Light Bulbs

WLJH 6000K White 2821 Light Bulbs

WLJH LED bulbs are a simple and cost-effective way to upgrade your vehicle's Instrument Panel lighting. Replace your old dingy incandescent bulbs with a long-lasting LED bulb for the Instrument Panel cluster. Not only do the WLJH LED bulbs come in modern cool; lighting, but they are also offered in an array of colors allowing you to customize the dash of your vehicle. from the original, orange-sleeved, incandescent bulb illumination to other vivid color LED illumination. Super Bright 3-SMD LED 3030 Chipset  - 300% brighter than stock lamps. Latest LED Technology - no flickering, no UV light emission,no irradiation. Easy plug-and-play installation - no polarity, no soldering or modifications needed, plug-and-play led. High-Quality Aluminum Body  - low temperature, low power consumption, long-lasting life of up to 60,000 hours.

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View all 11 replacement options for size 2821 →

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.

Audi A4 Bulb Size by Year