Used for: Headlight Bulb Low Beam
Used for: Back Up Reverse Light Bulb, Turn Signal Light Bulb Rear(Base)
Used for: Brake Light Bulb, Side Marker Light Bulb Rear(Avant), Tail Light Bulb, Turn Signal Light Bulb Rear(Avant)
Used for: Center High Mount Stop Light Bulb
Used for: License Plate Light Bulb
Used for: Parking Light Bulb
Used for: Side Marker Light Bulb Front, Turn Signal Light Bulb Front Inner
Used for: Side Marker Light Bulb Rear(Base), Stepwell Light Bulb
Used for: Side Marker Light Bulb Rear(Base), Stepwell Light Bulb
Used for: Turn Signal Light Bulb Front Outer
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.
The 2001 Audi S4 uses a D2S bulb for the low beam headlight.
The license plate light bulb is listed as 6418.
The front parking light bulb is listed as 64132.
The front outer turn signal bulb is listed as 2827.
The front inner turn signal bulb is listed as 3457A.
The front side marker light bulb is listed as 3457A.
The rear turn signal light bulb on the base setup is listed as 7506.
The back up reverse light bulb is listed as 7506.
The brake light bulb and tail light bulb are both listed as 7528.
The center high mount stop light bulb is listed as 2723.
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.
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.
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.
Not always. Aftermarket conversions may use the same bulb designation in some cases, but the projector, ballast, and housing design must also be compatible.
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.
