Audi A4 2005 Bulb Size
Bulb size chart
This page for the 2005 Audi A4 helps you verify the correct bulb size by lighting position, so you can match the right lamp to the right socket before you buy. Because the A4 was offered in different body styles and lighting packages, the exact bulb can change between the sedan, Avant wagon, and Cabriolet, as well as between halogen and HID headlight setups.
Use the bulb chart to narrow down the fitment for exterior lights, interior lights, and cargo-area lamps. Whether you are replacing a license plate bulb, a rear turn signal, a low beam, or a dome light, checking the location first is the easiest way to avoid ordering the wrong part for your 2005 Audi A4.
Fitment can vary by trim, market, and package, so always compare the bulb position on your car with the chart before purchasing. Headlight and fog light options may differ between halogen and LED-style replacements, and some aftermarket conversions are not direct plug-and-play swaps even when the base bulb size looks similar. If your A4 has been modified, or if you are unsure whether it uses a standard incandescent bulb, HID capsule, or LED upgrade, remove the installed bulb and confirm the marking on the base before ordering. That quick check is especially helpful for exterior lamps where the same model year may use different bulbs across body styles.
FAQ
What is the best way to use this 2005 Audi A4 bulb page?
Start with the light position, such as low beam, rear turn signal, license plate, or dome light. Then match that position to the bulb size listed for your body style and lighting package. This is the safest way to confirm fitment on a 2005 Audi A4.
Do all 2005 Audi A4 models use the same bulbs?
No. The bulb size can change depending on whether your car is a Base sedan, Avant wagon, or Cabriolet, and whether it has halogen or HID headlights. Trim and market differences can also affect fitment.
Which bulb is listed for the front low beam on the Avant with halogen headlights?
The 2005 Audi A4 Avant with halogen headlights uses an H7 bulb for the low beam.
Which bulb is listed for the Avant with HID low beams?
The 2005 Audi A4 Avant with HID headlights uses a D1S bulb for the low beam.
Which bulb is listed for the Cabriolet with HID low beams?
The 2005 Audi A4 Cabriolet with HID headlights uses a D2S bulb for the low beam.
What bulb does the 2005 Audi A4 use for the front outer turn signal?
The front outer turn signal bulb is listed as 2827.
What bulb is used for the parking light and front side marker?
The parking light bulb and the front side marker bulb are both listed as 3457A.
What bulb size is used for the daytime running light and reverse light?
Both the daytime running light bulb and the back up reverse light bulb are listed as 7506.
What bulb is used for the rear turn signal on this Audi A4?
The rear turn signal light bulb is listed as 7507.
Which bulb fits the license plate lights?
The license plate light bulb is listed as 6418.
What bulb should I use for the glove box, trunk, and interior door lights?
Several interior positions use small festoon-style bulbs. The glove box light, trunk or cargo area light, interior door light, stepwell light, and some courtesy lights are listed as 2825 or 98, while other interior positions use 6418 depending on body style.
Are the Avant rear light bulbs different from the Base sedan or Cabriolet?
Yes. The Avant uses different rear lamp bulbs in some positions, including 7528 for the brake light, tail light, and rear side marker. The Base sedan and Cabriolet use different rear bulb listings, so check the exact body style before ordering.
What should I check before buying replacement bulbs for my 2005 Audi A4?
Confirm the exact light position, body style, and headlight type, then compare the installed bulb number if possible. This is the best way to avoid ordering the wrong bulb, especially for headlights, fog lights, and rear lamps.