Audi S4 2001 Bulb Size
Bulb size chart
This page covers bulb fitment for the 2001 Audi S4 and is organized by lighting position so you can quickly verify the correct bulb size before you buy. Because exterior and interior lighting can vary by body style, market, and equipment, it is best to match the bulb to the exact lamp location on your car rather than relying on a single all-purpose list.
Use this 2001 Audi S4 bulb guide to confirm common replacement points such as the low beam headlight, license plate lights, parking lights, turn signals, brake lights, reverse lights, and side markers. The goal is to make bulb selection easier and reduce the chance of ordering the wrong part for a specific socket or housing.
Fitment can differ between trims, lighting packages, and sedan versus Avant body styles, so always compare the bulb listed for your position with the bulb already installed in the car. If your S4 has been converted to LED or uses an aftermarket lighting kit, the original bulb size may still be the starting point, but the final fit can depend on the adapter, resistor, or housing design. Before purchasing, remove one working bulb and check the base and markings, especially for positions that may share similar-looking bulbs across front and rear lamps.
FAQ
What bulb size does the 2001 Audi S4 use for the low beam headlight?
The 2001 Audi S4 uses a D2S bulb for the low beam headlight.
What is the license plate light bulb size on a 2001 Audi S4?
The license plate light bulb is listed as 6418.
What bulb fits the front parking light on this model year?
The front parking light bulb is listed as 64132.
What bulb size is used for the front outer turn signal?
The front outer turn signal bulb is listed as 2827.
What bulb size is used for the front inner turn signal?
The front inner turn signal bulb is listed as 3457A.
What bulb fits the front side marker light?
The front side marker light bulb is listed as 3457A.
What bulb size is used for the rear turn signal on the base setup?
The rear turn signal light bulb on the base setup is listed as 7506.
What bulb size is used for the back up reverse light?
The back up reverse light bulb is listed as 7506.
What bulb size is used for the brake light and tail light?
The brake light bulb and tail light 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.
Do sedan and Avant versions of the 2001 Audi S4 use the same rear bulbs?
Not always. Rear lighting can vary by body style, so the sedan and Avant may use different bulb positions or lamp layouts even when some bulb sizes overlap.
Why should I check the bulb already installed before ordering?
Because trim level, market, and lighting package differences can change fitment. Checking the installed bulb helps confirm the exact base and avoids ordering the wrong replacement.
Can I replace the original bulbs with LED bulbs?
Yes, in many positions you can use LED replacements, but fitment and function depend on the housing, polarity, and whether the car needs resistors or error-free bulbs.
Are aftermarket headlight conversions a direct match for the factory bulb size?
Not always. Aftermarket conversions may use the same bulb designation in some cases, but the projector, ballast, and housing design must also be compatible.
Which bulbs on this page are most likely to vary by equipment or market?
Headlight, rear lamp, and marker light fitment can vary the most, so it is smart to verify those positions first on your specific 2001 Audi S4.