Audi A6 2003 Bulb Size
Bulb size chart
This page helps you verify the correct bulb sizes for the 2003 Audi A6 by lighting position, so you can match the bulb to the exact lamp before you buy. Because Audi used different lighting setups across markets and body styles, checking the position on the vehicle is the safest way to confirm fitment.
For the 2003 Audi A6, common exterior and interior bulbs include D2S low beams, H1 high beams, 2827 front turn signals, 3457A front side markers, 7506 rear turn signals and reverse lights, 7528 brake, tail, and rear side marker bulbs, plus several interior and convenience lights such as 6418, 6411/6428, and 2825 sizes. Use the chart below to narrow down the right bulb for each location.
Fitment can vary with trim level, lighting package, and market, so always compare the bulb in your car with the listing before ordering. This is especially important if your A6 has halogen or HID components, or if you are considering an LED upgrade or other aftermarket conversion. Some LED replacements may fit physically but still require the correct base style, polarity, or extra hardware to work properly. If possible, remove the installed bulb and check the number printed on the base before you purchase replacements.
FAQ
What low beam bulb does the 2003 Audi A6 use?
The listed low beam bulb for the 2003 Audi A6 is D2S. This is the bulb size shown for the headlight low beam position on this page.
What high beam bulb fits the 2003 Audi A6?
The high beam bulb listed for the 2003 Audi A6 is H1. Always confirm the headlamp type on your car before ordering, since lighting packages can differ.
Which bulb is used for the front outer turn signal?
The front outer turn signal bulb listed for this model is 2827.
What is the front side marker bulb size on a 2003 Audi A6?
The front side marker bulb is listed as 3457A.
What bulb fits the rear turn signal and reverse light positions?
Both the rear turn signal light and the back up reverse light are listed as 7506 bulbs on this page.
Which bulb is used for the brake light on this Audi A6?
The brake light bulb listed for the 2003 Audi A6 is 7528.
What bulb fits the tail light and rear side marker?
The tail light bulb and the rear side marker bulb are both listed as 7528.
What bulb size is used for the center high mount stop light?
The center high mount stop light bulb is listed as 2723.
What bulb fits the license plate lights?
The license plate light bulb listed for this vehicle is 6418.
Which interior bulbs use the 6418 size?
On this page, the vanity mirror light, glove box light, trunk or cargo area light, stepwell light, and one courtesy light option are all listed as 6418 bulbs.
Which bulbs use the 6411 or 6428 size?
The dome light bulb and engine compartment light bulb are listed as 6411 or 6428. These two sizes are shown together for those positions.
What bulb is used for the map light?
The map light bulb listed for the 2003 Audi A6 is 64111.
What are the fog light bulb options?
The front fog light bulb is listed as H3C or H3, depending on the vehicle setup.
Why does the bulb chart mention trim and lighting package differences?
Because the 2003 Audi A6 could be equipped differently by market, body style, or lighting package, the exact bulb in one car may not match another. Checking the bulb by position and comparing it to the installed part helps avoid mistakes.