Audi S4 2004 Bulb Size
Bulb size chart
This 2004 Audi S4 bulb size guide is designed to help you verify the correct bulb by lighting position, so you can match the right part to the right lamp before you buy. Because the S4 could be equipped with different body styles and lighting packages, the bulb list may vary between Avant, Cabriolet, and other market-specific setups.
Use this page as a quick reference for exterior, interior, and cargo-area lighting on the 2004 Audi S4. From headlights and fog lights to license plate, dome, map, and courtesy lamps, the chart below helps narrow down the bulb size for each location on the car.
Fitment can change with trim, package, and headlight type, so always confirm whether your 2004 Audi S4 uses halogen or HID lighting before ordering. Aftermarket LED upgrades may fit physically but still need the correct base and may not work well with every housing or reflector. Some conversions can also trigger bulb-out warnings or change beam pattern, especially in headlamps and fog lamps. The safest approach is to check the bulb already installed in your car, compare it with the chart, and replace it with the same size unless you are intentionally upgrading and know the compatibility details.
FAQ
What bulb size does the 2004 Audi S4 use for the low beam headlight on the Avant with HID headlights?
The chart lists D1S for the Avant low beam when equipped with HID headlights.
What is the low beam bulb size for the Cabriolet with HID headlights?
The Cabriolet with HID headlights uses a D2S low beam bulb.
What high beam bulb does the 2004 Audi S4 Avant use?
The Avant high beam bulb is listed as H7.
What high beam bulb is used on the Cabriolet with halogen headlights?
The Cabriolet with halogen headlights uses an H9 high beam bulb.
Which bulb fits the front fog lights on the 2004 Audi S4?
The front fog light bulb is listed as H11 LED or H16 LED, depending on the setup shown in the chart.
What size is the front turn signal bulb on this S4?
The front outer turn signal bulb is 2827, and the front inner turn signal bulb is 3457A.
What bulb does the rear turn signal use?
The rear turn signal bulb is listed as 7507.
What bulb size is used for the license plate lights?
The license plate light bulb is 6418.
What bulb fits the dome light and map light?
The dome light uses 6411 or 6428, and the map light is listed as 64111.
Which bulb should I use for the glove box, interior door, and stepwell lights?
Those interior locations are listed with 2825 or 98 bulbs.
What is the reverse light bulb size on the 2004 Audi S4?
The back up reverse light bulb is 7506.
What bulb does the Avant use for the daytime running light?
The Avant daytime running light bulb is listed as 7506.
What bulb size is used for the Avant brake light and tail light?
The Avant brake light bulb is 7528, and the tail light bulb is also listed as 7528 for one of the chart options.
Do the bulb sizes differ between the Avant and Cabriolet?
Yes. The chart shows different bulbs for the Avant and Cabriolet in several positions, including low beams, cargo-area lights, courtesy lights, and brake or tail lamps.
Should I verify the installed bulb before buying replacements?
Yes. Because trim, market, and lighting package differences can affect fitment, checking the bulb already installed in your 2004 Audi S4 is the best way to confirm the correct replacement.