Audi A4 2001 Bulb Size
Bulb size chart
This 2001 Audi A4 bulb guide helps you verify the correct bulb size by lighting position, so you can replace a failed lamp with confidence. Because Audi used different lighting setups depending on trim, body style, and market, it is important to match the bulb to the exact location on the car rather than relying on a single “one-size-fits-all” answer.
Use this page as a quick reference for common exterior and interior lighting points on the 2001 A4, including headlights, tail lamps, turn signals, parking lights, license plate lights, and reverse lights. Checking the bulb by position makes it easier to compare what is installed on your car with the listed fitment before you buy replacements.
For best results, confirm the trim and lighting package on your 2001 Audi A4 before ordering bulbs, since halogen and HID-equipped cars may use different components in the same general area. Some aftermarket LED conversions can also change the required bulb type, trigger bulb-out warnings, or fit differently in the housing. If possible, remove the old bulb and compare the base, connector, and glass shape before purchase, especially on positions that can vary by market or body style.
FAQ
What low beam headlight bulb does a 2001 Audi A4 use?
The 2001 Audi A4 low beam headlight bulb listed for this page is D2S. This is especially important to verify on cars with factory HID lighting, since the low beam setup is different from standard halogen bulbs.
What bulb fits the front turn signal on a 2001 Audi A4?
The front turn signal bulb is listed as 2827 for the outer position and 3457A for the inner position. Because the A4 can have different lamp layouts depending on trim and market, check which front signal location you are replacing before ordering.
What bulb is used for the rear turn signal on this Audi A4?
The rear turn signal bulb listed for the 2001 Audi A4 is 7506. This same bulb type is also listed for the back up reverse light on this page, so make sure you are replacing the correct socket location.
What bulb does the back up reverse light use?
The back up reverse light bulb is listed as 7506. If your reverse light is out, confirm the bulb and socket condition together, since corrosion or a loose connection can look like a bulb failure.
What bulb fits the brake light and tail light on a 2001 Audi A4?
Both the brake light bulb and the tail light bulb are listed as 7528. That makes it easier to keep the rear lighting matched, but you should still check the actual lamp position before replacing anything.
What is the license plate light bulb size for the 2001 Audi A4?
The license plate light bulb is listed as 6418. If the plate lights are dim or uneven, it is a good idea to replace bulbs in pairs so the light color and brightness stay consistent.
What bulb is used for the parking light?
The parking light bulb listed for this page is 64132. Parking light fitment can vary with lighting package, so verify the bulb in the housing if your car has been modified or repaired before.
What bulb fits the center high mount stop light?
The center high mount stop light bulb is listed as 2723. If the third brake light is not working, check the bulb first and then inspect the connector and lens assembly for heat damage or moisture.
Are the side marker bulbs the same front and rear?
No. The front side marker bulb is listed as 3457A, while the rear side marker bulb is listed as 2825, 98. Always match the bulb to the exact marker location to avoid fitment mistakes.
What bulb does the stepwell light use on a 2001 Audi A4?
The stepwell light bulb is listed as 2825, 98. Interior courtesy and stepwell lamps are often overlooked, so checking the old bulb size before buying is a smart move.
Can I switch these bulbs to LED replacements?
In many cases, yes, but fitment and performance can vary. LED replacements may not sit correctly in the housing, may produce different light output, or may cause warning messages on some Audi A4 setups, so it is best to confirm compatibility before converting.
Why should I check the installed bulb before ordering a replacement?
Because the 2001 Audi A4 can vary by trim, body style, and market, the installed bulb is the best confirmation of fitment. Comparing the old bulb to the listed size helps avoid returns and ensures the replacement matches the connector and base style.