Audi S8 2003 Bulb Size
Bulb size chart
This 2003 Audi S8 bulb guide helps you verify the correct bulb sizes by lighting position, so you can replace a failed lamp with the right fit the first time. Because the S8 could be equipped with different lighting setups, the exact bulb used on your car may depend on the headlight type, market, and body style.
Use this page as a quick reference for exterior and interior bulbs on the 2003 Audi S8. From low beams and fog lights to license plate, dome, and trunk lights, the chart is organized by location to make comparison and replacement easier.
Before buying, confirm your trim and lighting package, since fitment can vary between halogen and HID-equipped cars and between regional specifications. Aftermarket LED conversions may change bulb type, beam pattern, or warning behavior, so match the bulb to the original socket and function rather than relying on appearance alone. If possible, remove the installed bulb and compare it before ordering, especially for exterior lamps and any interior bulb that may have been replaced previously.
FAQ
What low beam bulb does a 2003 Audi S8 use?
The 2003 Audi S8 uses H1 low beam bulbs with halogen headlights and D2S low beam bulbs with HID headlights. Check your headlight housing before ordering, because the correct bulb depends on the factory setup.
How do I know whether my S8 has halogen or HID headlights?
Look at the headlight assembly and the bulb base, or check the original equipment on the car. The bulb chart for this year lists H1 for halogen low beams and D2S for HID low beams, so the installed setup determines the replacement.
What bulb fits the front fog lights on a 2003 Audi S8?
Front fog light fitment is listed as H3C or H3. Because both are shown for this model year, it is important to verify the bulb currently installed in your car before purchasing.
What are the front turn signal bulb sizes on the 2003 Audi S8?
The front inner turn signal bulb is listed as 2357A, while the front outer turn signal bulb is listed as 2827. These are separate positions, so do not assume both sides use the same bulb.
What bulb is used for the rear turn signals and reverse lights?
Both the rear turn signal light and the back up reverse light are listed as 7506 bulbs on the 2003 Audi S8. That makes it easier to keep the correct spare on hand for rear lighting repairs.
Which bulb fits the brake and outer tail lights?
The brake light bulb and the outer tail light bulb are both listed as 7528. If one of these fails, you can use the same bulb size for either position on this model year.
What bulb does the inner tail light use on the 2003 Audi S8?
The inner tail light bulb is listed as 5007. The rear side marker light also uses 5007, so the same bulb size appears in more than one rear lighting position.
What bulb size is used for the side marker lights?
The front side marker light bulb is listed as 2357A and the rear side marker light bulb is listed as 5007. Front and rear markers are different on this vehicle, so check the location carefully.
What interior bulbs are listed for the 2003 Audi S8?
Interior bulb positions include the dome light with 6411 or 6428, the map light with 64111, the license plate light with 6418, and several cabin locations such as the vanity mirror, trunk or cargo area, interior door light, stepwell light, and ash tray light. The glove box light is listed as 3893.
Can I replace the bulbs with LEDs on my 2003 Audi S8?
Yes, many owners choose LED replacements, but fitment and compatibility can vary. Make sure the LED matches the original bulb size, and be aware that some positions may need additional attention for beam pattern, dimming, or warning messages.
Why does the bulb chart mention that trim and lighting package can vary?
Audi used different lighting combinations by market and body style, and some cars may have had optional equipment. That is why the page is organized by lighting position and why checking the installed bulb is the safest way to confirm fitment.