Audi A4 2021 Bulb Size

Bulb size chart

Headlight Bulb High Beam - D5S
Headlight Bulb High Beam and Low Beam(with HID headlights) - D5S
Headlight Bulb High Beam and Low Beam(with LED headlights) - LED
Headlight Bulb Low Beam - D5S
Back Up Reverse Light Bulb - LED
Brake Light Bulb - LED
Center High Mount Stop Light Bulb - LED
Cornering Light Bulb - H8 LED, 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
Turn Signal Light Bulb Front - 12174NA
Turn Signal Light Bulb Front(with HID headlights) - 64132
Turn Signal Light Bulb Front(with LED headlights) - LED
Turn Signal Light Bulb Rear - LED
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

D5S Bulbs

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

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 →

H8 LED Bulbs

Used for: Cornering Light Bulb

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 →

12174NA Bulbs

Used for: Turn Signal Light Bulb Front

View all 10 replacement options for size 12174NA →

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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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 page helps you verify the bulb sizes for the 2021 Audi A4 by lighting position, so you can match the correct bulb before ordering. Because Audi used different lighting setups depending on trim, package, and market, checking the exact location is the safest way to confirm fitment for exterior and interior lights.

For the 2021 Audi A4, many positions use LED lighting, while some headlight and front turn signal setups vary by equipment. Use the bulb chart on this page to compare the light position on your car with the listed bulb type, especially if your A4 has LED headlights, HID headlights, or a different trim-level lighting package.

Fitment can change with body style, region, and optional equipment, so always compare your car’s installed bulb and housing before buying replacements. The 2021 Audi A4 may use LED assemblies in many places, but some versions still differ between halogen, HID, and LED headlight configurations, and aftermarket conversions can affect compatibility. If you are replacing a bulb, inspect the original part number or remove the bulb first to confirm the exact match before purchase, especially for front turn signals, headlights, and any exterior lighting that may have been upgraded previously.

FAQ

Does the 2021 Audi A4 use the same bulb sizes on every trim?

Not always. Trim level, lighting package, body style, and market can change the bulb setup, especially for headlights, front turn signals, and cornering lights.

Which lighting positions on the 2021 Audi A4 are listed as LED?

Many positions are listed as LED, including the center high mount stop light, brake light, license plate light, parking light, tail light, daytime running light, rear turn signal, reverse light, and several interior lights.

What bulb is used for the glove box light on the 2021 Audi A4?

The glove box light bulb is listed as 2821.

What bulb is used for the front turn signal on A4 models with HID headlights?

The front turn signal bulb for versions with HID headlights is listed as 64132.

What headlight bulb type is used on the 2021 Audi A4 with HID headlights?

The HID headlight bulb type listed for high beam, low beam, and combined high/low beam applications is D5S.

What bulb is listed for the front turn signal on A4 models without the HID headlight setup?

The front turn signal bulb listed for that setup is 12174NA.

Does the 2021 Audi A4 use different headlight bulbs with LED headlights?

Yes. For A4 models with LED headlights, the headlight high beam and low beam positions are listed as LED rather than a replaceable halogen-style bulb.

Is the cornering light on the 2021 Audi A4 always LED?

The cornering light is listed as LED with an H8 LED note, so it should be checked against the exact lighting package on the vehicle.

Why should I check the installed bulb before ordering parts?

Because the 2021 Audi A4 can have different lighting configurations, and the same model year may use different bulbs depending on the equipment installed from the factory or changed later.

Can aftermarket LED conversions change fitment on the 2021 Audi A4?

Yes. Aftermarket conversions can alter bulb type, connector fit, heat management, and error-free operation, so it is important to verify the actual bulb and housing before buying replacements.

Are interior bulbs on the 2021 Audi A4 all the same?

No. Interior lighting positions such as vanity mirror, dome, map, interior door, trunk or cargo area, stepwell, and glove box can use different bulb types or LED modules depending on the vehicle.

What is the best way to use this page for bulb replacement?

Match the lighting position on your 2021 Audi A4 to the chart, confirm whether your car has LED, HID, or another headlight package, and then verify the installed bulb or part number before ordering.

Audi A4 Bulb Size by Year