Audi A4 2003 Bulb Size

Bulb size chart

Fog Light Bulb Front - H11 LED, H16 LED
Headlight Bulb High Beam(Base) - H7
Headlight Bulb High Beam(Cabriolet, with halogen headlights) - H9
Headlight Bulb Low Beam(Base, with halogen headlights) - H7
Headlight Bulb Low Beam(Base, with HID headlights) - D1S
Headlight Bulb Low Beam(Cabriolet, with HID headlights) - D2S
Back Up Reverse Light Bulb - 7506
Brake Light Bulb(Base) - 7528
Brake Light Bulb(Cabriolet) - 7225
Center High Mount Stop Light Bulb - LED
Daytime Running Light Bulb - 2825, 98
License Plate Light Bulb - 6418
Parking Light Bulb - 2825, 98
Side Marker Light Bulb Front - 3457A
Side Marker Light Bulb Rear - 5007
Stepwell Light Bulb - 2825, 98
Tail Light Bulb - 7225
Turn Signal Light Bulb Front Inner - 3457A
Turn Signal Light Bulb Front Outer - 2827
Turn Signal Light Bulb Rear - 7507
Courtesy Light Bulb(Base) - 2825, 98
Courtesy Light Bulb(Cabriolet, Compare to original - Option 2) - 6418
Dome Light Bulb - 6411, 6428
Engine Compartment Light Bulb - 6411, 6428
Glove Box Light Bulb - 2825, 98
Interior Door Light Bulb - 2825, 98
Map Light Bulb - 64111
Trunk or Cargo Area Light(Base) - 6418
Trunk or Cargo Area Light(Cabriolet) - 2825, 98
Vanity Mirror Light Bulb - 6418

H11 LED Bulbs

Used for: Fog Light Bulb Front

View all 5 replacement options for size H11 LED →

H16 LED Bulbs

Used for: Fog Light Bulb Front

View all 5 replacement options for size H16 LED →

H7 Bulbs

Used for: Headlight Bulb High Beam(Base), Headlight Bulb Low Beam(Base, with halogen headlights)

View all 22 replacement options for size H7 →

H9 Bulbs

Used for: Headlight Bulb High Beam(Cabriolet, with halogen headlights)

Sealight L2 Series

Sealight L2 Series

Simple installation: it’s been designed as a plug-and-play lighting solution, so does not need the help of a mechanic to fit into most cars. No pain of 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 high-density aluminum body, ensuring up to 50,000 hrs lifespan. No spots: with a 360-degree light output radius, these bulbs remove all dark spots and provide a much wider angle of output than with standard bulbs.

$27.94

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PIAA 19665 H9 Xtreme White Plus

PIAA 19665 H9 Xtreme White Plus

If you’re looking for better visibility on your road, then Xtreme White Hybrid bulbs should be at the top of your list. These high-quality glasses and alloy filaments provide more contrast to what can sometimes become dim or dull light from stock lamps so that way not only do they allow car lovers to see farther but also safer as well! Made with safety in mind from the start these products have been designed by professionals who know exactly how important it is to have functioning bulbs in any season and during every weather.

$67.25

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KATANA H9 LED Headlight Bulbs

KATANA H9 LED Headlight Bulbs

Introducing the KATANA H9 LED Headlight Bulbs, the perfect solution for all your lighting needs on the road. This LED headlight bulb is 400% brighter than the original halogen lamp, providing you with 4 times the brightness and allowing you to see farther and wider. The H9 LED headlight has a 360° beam angle that ensures you have a perfect beam pattern without any dark spots, making it safe to drive in all weather conditions - be it rainy, foggy, or snowy. The installation process is simple and hassle-free, with a plug-and-play design that is almost 1:1 to the halogen lamp. You don't need any tools or modifications, and the installation can be completed in just 10 minutes. The KATANA H9 LED Headlight Bulbs are compatible with 99% of vehicles and come with an upgraded CANBUS that ensures seamless operation.

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View all 10 replacement options for size H9 →

D1S Bulbs

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

View all 11 replacement options for size D1S →

D2S Bulbs

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

View all 9 replacement options for size D2S →

7506 Bulbs

Used for: Back Up Reverse Light Bulb

Osram 7506 Original Light Bulbs with Metal Bases

Osram 7506 Original Light Bulbs with Metal Bases

As the leading global provider, OSRAM takes pride in being the foremost manufacturer of automotive bulbs, catering to the needs of vehicle manufacturers worldwide. Their unmatched expertise has made them the trusted supplier for millions of cars and trucks manufactured by renowned automotive giants. Here, we proudly offer the OSRAM 7506 (P21W-382) bulb, identical to the ones provided directly to vehicle manufacturers. It boasts an exceptional price-to-performance ratio, ensuring top-notch quality at an affordable rate. With a combination of superior craftsmanship, remarkable luminosity, and unwavering durability, OSRAM's Original Equipment products outshine many other bulbs available in the market, providing a genuine advantage for discerning customers.

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Ruiandsion 7506 LED Light Bulbs (BA15S Base)

Ruiandsion 7506 LED Light Bulbs (BA15S Base)

Introducing the Ruiandsion 7506 LED Light Bulbs, the perfect solution for upgrading your vehicle's lighting system. With a host of impressive features, these bulbs are designed to deliver enhanced performance and convenience. One standout feature of this 1156 LED Bulb is its Non-Polarity Design. Gone are the days of worrying about polarity sensitivity during installation. The plug-and-play functionality ensures a hassle-free experience, whether your vehicle has a negative earth or positive earth system. Installing these bulbs is as easy as it gets. Get ready to experience a clean and crisp illumination with the striking White color emitted by these bulbs. The 3030 chips incorporated in each bulb guarantee a powerful and consistent output of light. With 16 LEDs per bulb, you can expect a remarkably bright and even distribution of light across your surroundings. Durability is at the core of the Ruiandsion 7506 LED Light Bulbs. Designed to withstand extreme conditions, they operate flawlessly within a wide temperature range, from -40 to +75 degrees. Whether you're facing scorching heat or freezing cold, these bulbs will keep shining brightly, ensuring optimal visibility for your journeys.

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View all 12 replacement options for size 7506 →

7528 Bulbs

Used for: Brake Light Bulb(Base)

KATUR 7528 Super Bright LED Light Bulbs

KATUR 7528 Super Bright LED Light Bulbs

The KATUR 7528 Super Bright LED Light Bulbs are a great choice for anyone looking to upgrade their vehicle's lighting. With a 360° lighting angle and a perfect beam pattern, these bulbs offer bright and safe driving lighting with no dark spots or glare for other drivers. The operating voltage is 12V-24V and the wattage is 24W, making these bulbs a more efficient choice compared to halogen or incandescent bulbs. These LED bulbs have a built-in stable constant current IC driver that ensures a longer lifespan and adjusts the current automatically. The built-in Canbus function makes them error-free and eliminates hyper flash, making them compatible with most cars. The non-polarity design makes installation a breeze, with a simple plug-and-play setup. These standard bulbs are brighter and more energy-efficient, offering enough light to improve your driving experience.

$22.99

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7225 Bulbs

Used for: Brake Light Bulb(Cabriolet), Tail Light Bulb

LUYED 7225 White LED Light Bulb

LUYED 7225 White LED Light Bulb

This product features an integrated smart IC driver and aviation-grade aluminum for improved functionality. These elements ensure stability in input current, protecting the circuitry while maintaining a safe temperature range and consistent brightness. Consequently, the LED bulb life is extended, reaching up to 50,000 hours. The brightness significantly surpasses that of the original bulb, providing superior illumination. Designed to match the original bulb in a 1:1 ratio, it fits perfectly in the same installation location without necessitating any modifications or additional wiring.

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2825 Bulbs

Used for: Daytime Running Light Bulb, Parking Light Bulb, Stepwell Light Bulb, Courtesy Light Bulb(Base), Glove Box Light Bulb, Interior Door Light Bulb, Trunk or Cargo Area Light(Cabriolet)

View all 12 replacement options for size 2825 →

98 Bulbs

Used for: Daytime Running Light Bulb, Parking Light Bulb, Stepwell Light Bulb, Courtesy Light Bulb(Base), Glove Box Light Bulb, Interior Door Light Bulb, Trunk or Cargo Area Light(Cabriolet)

View all 10 replacement options for size 98 →

6418 Bulbs

Used for: License Plate Light Bulb, Courtesy Light Bulb(Cabriolet, Compare to original - Option 2), Trunk or Cargo Area Light(Base), Vanity Mirror Light Bulb

Philips 6418 Ultinon LED Bulb

Philips 6418 Ultinon LED Bulb

If you are looking to upgrade your style without buying a new car, replacing your interior and exterior lighting with Philips Ultinon LEDs is a smart way to spend your money. Philips Ultinon LED lights are a direct replacement for conventional bulbs. They’re easy to install and available for a wide range of interior and exterior applications. Whether it’s for backup, stopping, or signaling, Philips Ultinon exterior lighting is designed to provide excellent light distribution. The light is projected where you need it so not only can you see more inside your car, you can see more on the road. Make a statement and get noticed with Philips LEDs.

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3457A Bulbs

Used for: Side Marker Light Bulb Front, Turn Signal Light Bulb Front Inner

TUINCYN 3457A Switchback LED Light Bulb

TUINCYN 3457A Switchback LED Light Bulb

Introducing the TUINCYN 3457A Switchback LED Light Bulb, a revolutionary lighting solution designed to elevate your driving experience. This bulb is specifically crafted for the standard 3157 socket, offering seamless compatibility and a hassle-free installation process. Please note that it is not compatible with the CK socket base.With the included 50W 8 ohm Load Resistors Harness Set, the TUINCYN 3457A ensures a higher decoder rate compared to traditional 6 ohm load resistors. This innovative feature guarantees optimal performance and eliminates any potential flickering issues. You can trust this bulb to deliver reliable and consistent illumination. Enjoy superior brightness with the TUINCYN 3457A Switchback LED Light Bulb. Its output is significantly brighter than normal incandescent bulbs, ensuring enhanced visibility on the road. Whether you need parking lights, daytime running lights (DRL), or turn signal lights, this versatile bulb has got you covered.With its unique dual-color functionality, the TUINCYN 3457A bulb can switch between xenon white and yellow/amber light. It illuminates xenon white for parking lights or DRL, providing a crisp and modern appearance. When it comes to turn signal lights, the bulb flashes in an "AMBER-OFF-AMBER-OFF" pattern, effectively signaling your intentions to other drivers. Operating at a voltage range of DC 12V-24V, this LED bulb offers versatility and compatibility with various vehicles. Emitting 800 lumens of light, it ensures a powerful and bright illumination that enhances safety and visibility.Experience 360-degree lighting coverage with the TUINCYN 3457A Switchback LED Light Bulb. Its unique design ensures that light is evenly distributed in all directions, eliminating dark spots and providing a consistent and uniform lighting experience.

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TUINCYN 3457 Amber LED Light Bulb

TUINCYN 3457 Amber LED Light Bulb

ntroducing the TUINCYN 3457 Amber LED Light Bulb, a hassle-free lighting solution designed for easy installation and stunning illumination. With its plug and play feature, this bulb requires no complicated wiring, making it a convenient choice for all users. Crafted with meticulous attention to detail, the TUINCYN 3457 Amber LED Light Bulb features a robust and durable light body structure. Its point to point welding ensures exceptional strength, making it resistant to damage even in demanding conditions. This bulb is built to last, providing you with long-lasting and reliable performance. Experience superior lighting coverage with the 360 Degree Beam Angle design of the TUINCYN 3457 Amber LED Light Bulb. Illuminate every corner of your space with ease, as this bulb disperses light evenly in all directions. Say goodbye to dark spots and enjoy a well-lit environment that enhances visibility. Thanks to its advanced technology, this LED bulb boasts an impressive on/off response time, allowing for faster and more precise lighting transitions. Whether you need instant brightness or prefer a gradual fade, the TUINCYN 3457 Amber LED Light Bulb delivers an exceptional lighting experience tailored to your preferences. The socket type of this bulb is the standard 3157, ensuring compatibility with a wide range of fixtures and applications. Featuring 33 high-quality 5630 SMD LEDs per bulb, it emits a powerful 900 lumens of light, providing ample brightness for various indoor and outdoor settings.

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AUXITO LED Turn Signal Light Bulbs 3157 LED Bulbs Amber Yellow

AUXITO LED Turn Signal Light Bulbs 3157 LED Bulbs Amber Y...

Non-polarity. Can be used for front rear turn signal light, side marker light, blinker light, parking light, daytime running light, brake light, tail light, etc. When these 3157 led amber bulbs are used for turn signal lights or blinker lights, some vehicles may meet canbus issues, such as flicker, hyper flash or error warning, etc, load resistors or flasher relay may be required to solve the issues, you can contact us through Amazon Buyer Message to get help and solutions

$16.19

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View all 11 replacement options for size 3457A →

5007 Bulbs

Used for: Side Marker Light Bulb Rear

MAXGTRS 5007 LED Light Bulb (BAY15S)

MAXGTRS 5007 LED Light Bulb (BAY15S)

Introducing the MAXGTRS 5007 LED Light Bulb - Illuminate your vehicle with superior brightness and style. This bulb is specifically designed to enhance your driving experience and surpass the performance of ordinary halogen bulbs. Equipped with 24 high-quality 4014 LED chips and 6 advanced 3030 LED chips, the MAXGTRS 5007 ensures unparalleled luminosity. The large Condenser Lens guarantees a 360-degree beam angle, eliminating blind spots and providing concentrated illumination. With a staggering 300% increase in brightness compared to traditional bulbs, this LED light bulb will give your car a stunning new look. Installation is a breeze - simply plug and play. The built-in IC Circuit is designed to withstand wide voltage ranges from 10V to 30V, safeguarding the bulb against damage from voltage fluctuations and spikes. While the 1156 LED bulb is not CANBus error-free or anti-hyper flashing, you can easily address this with the addition of a 50W 6OHM load resistor decoder or flasher relay. This ensures that the LED bulbs illuminate with full power, preventing hyper flashing, blinking, flickering, or any malfunction error codes on your dashboard. What sets the MAXGTRS 5007 apart is its innovative no polarity design. With this feature, the bulb can be lit on either side, eliminating the need for flipping or additional modifications. Its ultra-short design makes it even more convenient to install, as it is shorter than the original car bulb. Within just 5 minutes, you can enjoy the benefits of this plug-and-play bulb.

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2827 Bulbs

Used for: Turn Signal Light Bulb Front Outer

KATUR Extremely Bright 2827 LED Light Bulbs

KATUR Extremely Bright 2827 LED Light Bulbs

Upgrade your vehicle's lighting with the KATUR Extremely Bright 2827 LED Light Bulbs and experience superior brightness, energy efficiency, and durability. Enjoy a crisp and clear white light with a color temperature of 6000K, providing enhanced visibility and a modern aesthetic. Don't settle for dim and outdated bulbs when you can have the best. Choose KATUR for exceptional quality and performance in LED lighting.With a T10 base type, these LED bulbs are a direct replacement for your existing car lights, making installation quick and hassle-free. Designed with three powerful 3030 SMD LEDs, these bulbs deliver an incredibly bright and crisp white light that enhances visibility and adds a touch of modern elegance to your vehicle. Thanks to the 360-degree beam angle, these LED bulbs offer a uniform and consistent illumination, eliminating hot spots and providing a wide coverage area. Whether you need to enhance your interior cabin lights, license plate lights, side marker lights, or any other compatible car light, these bulbs are up to the task. Operating at a voltage range of 12V to 16V, these bulbs are highly versatile and can be used in various vehicles without any compatibility issues. With a low wattage of 1.5W, they consume minimal power while still delivering an impressive brightness of 350 lumens. Say goodbye to inefficient incandescent bulbs and enjoy the benefits of energy-saving LED technology.

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7507 Bulbs

Used for: Turn Signal Light Bulb Rear

KATUR 7507 LED Yellow Bulbs (BAU15S Base)

KATUR 7507 LED Yellow Bulbs (BAU15S Base)

Enhance your driving experience with the KATUR 7507 LED Yellow Bulbs. Designed to deliver superior performance, these bulbs feature 12 high-power 3020 LED chips per bulb, boasting a maximum capacity of 80W while operating at an efficient 5.2W. With their distinctive Amber Yellow color, these bulbs provide optimal visibility and a unique aesthetic appeal. Say goodbye to dark spots and shadowed areas. These bulbs offer a perfect beam pattern, providing consistent and uniform light distribution in conditions of poor visibility caused by rain, fog, dust, or snow. Drive with confidence knowing that your surroundings are well-illuminated without causing glare to other drivers. 360° Full Angle Light: Enjoy an astounding emitted light effect with the KATUR 7507 LED Yellow Bulbs. Designed with a 360-degree full angle light, these bulbs deliver comprehensive and all-encompassing lighting, eliminating blind spots and ensuring optimal visibility from all angles. Rapid On/Off Response: Safety is a priority, and these bulbs deliver. With a lightning-fast on/off response time of just 0.1s, there is no delay in signaling your intentions. Experience a safer and more reliable turning experience, alerting other drivers promptly and effectively. Double Heat Dissipation: Built with an aircraft-grade aluminum body and a unique bump appearance design, these bulbs provide excellent heat dissipation. The increased heat dissipation area ensures optimal performance and longevity. With wide voltage and constant current, these bulbs offer a lifespan of up to 60,000 hours, ensuring long-lasting durability.

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6411 Bulbs

Used for: Dome Light Bulb, Engine Compartment Light Bulb

Wiseshine 6411 LED Dome Light Bulb

Wiseshine 6411 LED Dome Light Bulb

Introducing theWiseshine 6411 LED Dome Light Bulb, the ultimate lighting solution for a variety of applications. This top-quality bulb is engineered to provide outstanding performance, reliability, and longevity. Wiseshine 6411 LED Dome Light Bulb emits a natural white light with a color temperature of 4500k. This color creates a pleasant and soothing illumination that enhances visibility and creates a welcoming atmosphere. Each pack contains 6pcs of these high-quality LED bulbs, ensuring you have an ample supply to meet your lighting needs. Whether you're looking to upgrade your dome lights, reading lights, map lights, glove box lights, cargo lights, trunk lights, or license plate lights, this pack has you covered. Designed to operate with DC 24V input, this bulb is suitable for a wide range of vehicles and applications. Whether you need to replace bulbs in your car, truck, or boat, this Festoon LED bulb is compatible with your power source. Rest assured that this bulb is built to last. With a two-year quality assurance guarantee, you can trust in its reliability and performance. Wiseshine 6411 LED Dome Light Bulb is engineered with top-quality components, including 6 super bright chipsets 3030 1-watt LEDs. Each individual light produces an impressive 130-140 lumens, ensuring a bright and focused illumination.

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KATUR 6411 White LED Bulbs 39 mm

KATUR 6411 White LED Bulbs 39 mm

It's time to shed some light on your automotive life with the KATUR 6411 White LED Bulbs 39 mm. These little wonders are like a shining beacon of efficiency, delivering lower power consumption and a longer lifespan to keep you glowing for miles on end. With their lightning-fast light response and impeccable safety record, you'll never miss a beat on the road. Thanks to the high power 5630 chips and a mesmerizing 180-degree illumination angle, there won't be a blind spot in sight–prepare to witness your car basking in a radiant, renewed aura. And here's the cherry on top: installation is a breeze, taking a mere 5 minutes of your time, simply plug and play without causing any harm to your precious ride. Illuminate your world and embrace the brilliance of the KATUR 6411 White LED Bulbs 39 mm!

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6428 Bulbs

Used for: Dome Light Bulb, Engine Compartment Light Bulb

KATUR 6428 LED Interior Light Bulb

KATUR 6428 LED Interior Light Bulb

6500K Xenon White Experience the brilliant 6500K Daytime White brightness instantly with KaTur 31mm Festoon C5W LED Bulb. No lag, just immediate illumination. High Power 5630 Chips Enjoy the perfect beam patterns of the super bright 5630 Chips in the LED Front Rear Sidemarker Light. Say goodbye to dark spots, short beams, and scattered light. CanBus Error-Free Equipped with a CANBUS system, these bulbs work seamlessly without the need for additional resistors. Waterproof and reliable in any weather conditions, providing excellent visibility while driving. Easy Installation Install in just 5 minutes with a plug-and-play design. Non-destructive installation for Interior (Map, Dome, Cargo, Courtesy) Light, License Plate Light, Parking Light, Turn Signal Light, Corner Light, Side Marker Light, Tail Light, and Backup Lights. Suitable for cars, trucks, motorcycles, scooters, trailers, RVs, boats, and more.

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64111 Bulbs

Used for: Map Light Bulb

NJYTouch 64111 LED Light Bulbs - 10 pics

NJYTouch 64111 LED Light Bulbs - 10 pics

This isn't your grandmother's dusty old lamp bulb. Oh no. It's a modern marvel of illumination, one that promises to light up your world in ways you've never imagined. Just like that moment when you first hear a V12 engine roaring to life. And while most bulbs flicker, fade, and fumble, the NJYTouch stands its ground. It's the perfect blend of engineering and elegance, turning any dreary room into an amphitheater of light. It's as if someone took the brilliance of the midday sun and crammed it into a sleek, modern bulb design. Installation? Well, think of it as effortlessly cruising down the Autobahn. Slide it in, give it a twist, and voila! No faffing about. No calls to your electrician mate begging for assistance.

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Ruiandsion BA9S LED Bulbs - 64111

Ruiandsion BA9S LED Bulbs - 64111

In the grand theater of LED bulbs, the Ruiandsion 64111 isn't just another performer; it's the lead actor demanding an encore. This little marvel, adorned in a warm white hue, operates on a sprightly DC 6V, delivering a punchy 100lm while sipping a mere 0.36W. What's the magic? Four brilliantly engineered 3030 chips. And if installation woes keep you up at night, sleep easy. This is plug-and-play perfection, adaptable to both negative and positive earth, with a standard BA9S base that slides in as smoothly as a hot knife through butter.

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This 2003 Audi A4 bulb size guide helps you verify the correct bulbs by lighting position, so you can match the right fit before you buy. Because the A4 was offered with different trims, body styles, and lighting packages, the bulb used in one area may not be the same on every car.

Use this page to check common exterior and interior bulb locations such as headlights, turn signals, brake lights, license plate lights, dome lights, and cargo-area lamps. Matching the bulb to the exact position is the easiest way to avoid ordering the wrong part for your 2003 Audi A4.

For the best fitment results, always compare your vehicle’s trim and equipment with the bulb chart before ordering. Halogen and HID setups use different low-beam bulbs, and some lighting positions can vary between sedan, wagon, and Cabriolet models, as well as by market or lighting package. If your A4 has been converted to LED aftermarket bulbs, the size may still match, but brightness, polarity, heat management, and warning messages can differ from the original halogen setup. When possible, remove the installed bulb and check the base number or shape before purchase, especially for exterior lights and any cabin bulb that may have been replaced previously.

FAQ

What is the purpose of this 2003 Audi A4 bulb size page?

It helps you identify the correct bulb size by lighting position, such as low beam, high beam, brake light, or license plate light. That makes it easier to confirm the right replacement for your exact 2003 Audi A4 setup.

Do all 2003 Audi A4 models use the same bulbs?

No. Trim level, body style, and lighting package can change the bulb type. Cabriolet models, HID-equipped cars, and halogen-equipped cars may use different bulbs in the same location.

What low beam bulb does the base 2003 Audi A4 with halogen headlights use?

The base model with halogen headlights uses H7 bulbs for the low beam. Always confirm the headlamp type before ordering, since HID cars use a different bulb.

What low beam bulb does the base 2003 Audi A4 with HID headlights use?

The base model with HID headlights uses D1S for the low beam. This is not interchangeable with the halogen H7 setup.

What low beam bulb does the Cabriolet with HID headlights use?

The Cabriolet with HID headlights uses D2S for the low beam. That differs from the base sedan/wagon HID low beam bulb.

What high beam bulb does the base 2003 Audi A4 use?

The base 2003 Audi A4 uses H7 bulbs for the high beam. If your car has been modified, check the installed bulb before buying replacements.

What bulb is used for the front turn signal on this Audi A4?

The front outer turn signal uses 2827, and the front inner turn signal uses 3457A. These are separate locations, so it is important to check which socket you are replacing.

What bulb is used for the rear turn signal?

The rear turn signal bulb is 7507. This is one of the most common exterior bulbs to verify by position before purchase.

What bulb sizes are used for the parking light and daytime running light?

Both the parking light and daytime running light use 2825 or 98 on this page. If your car has a different market-specific lighting setup, confirm the installed bulb first.

What bulb is used for the license plate light?

The license plate light uses 6418. This same bulb number also appears in several interior and courtesy light positions on this A4.

What bulb does the dome light use?

The dome light uses 6411 or 6428. These are common interior bulb sizes, but the exact fit can depend on the housing and previous replacement parts.

What bulb is used for the back-up reverse light?

The back-up reverse light uses 7506. If one reverse light is out, it is often a good idea to replace both sides at the same time.

What bulb is listed for the brake light on the base model?

The base model brake light bulb is 7528. The Cabriolet uses 7225 for the brake light, so body style matters here.

What bulb is used for the tail light on the 2003 Audi A4?

The tail light bulb is 7225. This bulb number is also listed for the Cabriolet brake light, so check the exact lamp position on your vehicle.

Are LED bulbs listed for any positions on this page?

Yes. The center high mount stop light is listed as LED, and the front fog light position shows H11 LED or H16 LED. If you are converting to LED, make sure the bulb base and fitment match your housing.

Audi A4 Bulb Size by Year