Audi S4 2005 Bulb Size
Bulb size chart
This 2005 Audi S4 bulb size guide is organized by lighting position so you can quickly verify the correct replacement before you buy. Whether you are changing a headlight, tail light, interior lamp, or cargo light, the right bulb depends on where it is installed and, in some cases, on the body style or lighting package.
The 2005 Audi S4 was offered with different lighting setups across markets and trims, so the same model year can use more than one bulb type in certain locations. Use this page to match each bulb to its exact position on the car and confirm fitment for sedan, Avant, or Cabriolet applications when applicable.
For best results, compare the bulb listed here with the one already installed in your 2005 Audi S4 before ordering, especially if the car has been modified or converted to LED lighting. Trim level, factory package, halogen versus HID headlights, and body style can change fitment, and aftermarket LED replacements may require a different base, polarity check, or additional hardware. If your S4 has been retrofitted, do not assume the original bulb chart still applies exactly; verify the part number on the bulb itself and inspect the housing before purchase.
FAQ
What is the low beam bulb for a 2005 Audi S4 Avant with HID headlights?
The listed low beam bulb for the Avant with HID headlights is D1S. This applies to the HID-equipped Avant configuration, not the halogen version.
What low beam bulb does the 2005 Audi S4 Avant use with halogen headlights?
The 2005 Audi S4 Avant with halogen headlights uses an H7 low beam bulb.
Which high beam bulb fits the 2005 Audi S4 Avant?
The high beam bulb listed for the Avant is H7.
What bulb is used for the Cabriolet high beam on a 2005 Audi S4?
For the Cabriolet with halogen headlights, the high beam bulb is H9.
What is the rear turn signal bulb size for the 2005 Audi S4?
The rear turn signal bulb listed for this model year is 7507.
Which bulb fits the front outer turn signal on a 2005 Audi S4?
The front outer turn signal bulb is 2827.
What bulb is used for the parking light and front side marker on this S4?
Both the parking light and the front side marker use 3457A bulbs.
What bulb fits the daytime running light on the 2005 Audi S4?
The daytime running light bulb is 7506.
What are the reverse light and base brake light bulb sizes?
The back up reverse light uses 7506, and the base brake light uses 7506R.
Which bulb is listed for the Avant brake light and tail light?
For the Avant, the brake light bulb is 7528. The tail light bulb is also listed as 7528 in the compare-to-original option shown on this page.
What interior bulbs are commonly used in the 2005 Audi S4?
Several interior and utility locations use 2825 or 98 bulbs, including the glove box, trunk or cargo area, interior door light, stepwell light, and some courtesy light positions on the Avant.
What bulb fits the license plate light and vanity mirror light?
Both the license plate light and vanity mirror light use 6418 bulbs.
Which dome and engine compartment bulbs are listed for this Audi S4?
The dome light and engine compartment light are listed as 6411 or 6428 bulbs.
Are fog light bulbs the same on every 2005 Audi S4?
No. The front fog light listing shows H11 LED or H16 LED, so fitment can vary by setup and conversion. Check the housing and existing bulb before ordering.
Why should I check the installed bulb before buying a replacement?
Because the 2005 Audi S4 can vary by body style, market, and lighting package, the installed bulb is the safest reference. This is especially important for HID, halogen, and aftermarket LED conversions.