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Audi S4 2009 Bulb Size
Bulb size chart
Fog Light Bulb Front - H11 LED, H16 LED
Headlight Bulb High Beam and Low Beam - D3S
Back Up Reverse Light Bulb - 921
Brake Light Bulb - 7506R
Center High Mount Stop Light Bulb - LED
Daytime Running Light Bulb - LED
License Plate Light Bulb - 6418
Side Marker Light Bulb Front - 2825, 98
Stepwell Light Bulb - LED
Tail Light Bulb - 7506R
Turn Signal Light Bulb Front - 12272NA
Turn Signal Light Bulb Rear - 7506
Courtesy Light Bulb(Compare to original - Option 1) - 2825, 98
Courtesy Light Bulb(Compare to original - Option 2) - 6418
Glove Box Light Bulb - 2825, 98
Interior Door Light Bulb - 2825, 98
Map Light Bulb - 2825, 98
Trunk or Cargo Area Light - 2825, 98
Vanity Mirror Light Bulb - 6418
H11 LED Bulbs
Used for: Fog Light Bulb Front
H16 LED Bulbs
Used for: Fog Light Bulb Front
D3S Bulbs
Used for: Headlight Bulb High Beam and Low Beam
921 Bulbs
Used for: Back Up Reverse Light Bulb
7506R Bulbs
Used for: Brake Light Bulb, Tail Light Bulb
6418 Bulbs
Used for: License Plate Light Bulb, Courtesy Light Bulb(Compare to original - Option 2), Vanity Mirror Light Bulb
2825 Bulbs
Used for: Side Marker Light Bulb Front, Courtesy Light Bulb(Compare to original - Option 1), Glove Box Light Bulb, Interior Door Light Bulb, Map Light Bulb, Trunk or Cargo Area Light
98 Bulbs
Used for: Side Marker Light Bulb Front, Courtesy Light Bulb(Compare to original - Option 1), Glove Box Light Bulb, Interior Door Light Bulb, Map Light Bulb, Trunk or Cargo Area Light
12272NA Bulbs
Used for: Turn Signal Light Bulb Front
7506 Bulbs
Used for: Turn Signal Light Bulb Rear
This page helps you verify bulb sizes for the 2009 Audi S4 by lighting position, so you can match the correct bulb before you buy. Whether you are replacing an exterior lamp or a small interior bulb, checking the location first is the easiest way to avoid ordering the wrong part.
The 2009 Audi S4 uses a mix of LED, halogen, and standard miniature bulbs depending on the lamp position. Because fitment can vary by market, trim, and body style, use the bulb chart on this page as a position-by-position guide for headlights, fog lights, reverse lights, cabin lights, and rear signal bulbs.
For best results, compare the bulb listed on this page with the bulb already installed in your car before purchasing. Trim and lighting package differences can change fitment, especially on cars with factory LED equipment or different regional specifications. Some positions may use halogen bulbs in one setup and LED components in another, and aftermarket conversions can also affect the correct replacement. If your S4 has been modified, or if a previous owner changed the lighting hardware, checking the existing bulb and connector style is the safest way to confirm compatibility.
FAQ
What bulb does the 2009 Audi S4 use for the low beam and high beam headlights?
The headlight bulb listed for both high beam and low beam on this page is D3S. Use the bulb position on the chart to confirm you are replacing the correct headlamp function.
What is the front fog light bulb size for the 2009 Audi S4?
The front fog light bulb is listed as H11 LED or H16 LED, depending on the specific setup. Check the installed bulb and housing before ordering, since fog light fitment can vary.
What bulb fits the back up reverse lights on this model?
The reverse light bulb listed for the 2009 Audi S4 is 921. This is the bulb position to use when replacing the rear backup lamps.
What are the rear turn signal and tail/brake bulb sizes?
The rear turn signal bulb is listed as 7506, while the brake light bulb and tail light bulb are both listed as 7506R. Make sure to match the exact rear lamp position before buying.
What bulb is used for the front turn signal on the 2009 Audi S4?
The front turn signal bulb is listed as 12272NA. This is the front signal fitment shown for this year and model.
What bulb size is used for the license plate lights?
The license plate light bulb is listed as 6418. This same bulb size is also shown for the vanity mirror light and one courtesy light application on this page.
Which interior bulbs use 2825 or 98 bulbs on the 2009 Audi S4?
Several interior positions are listed with 2825 or 98 bulbs, including the glove box light, trunk or cargo area light, map light, interior door light, side marker light front, and one courtesy light application. Always confirm the exact location before ordering.
Does the 2009 Audi S4 use LED bulbs in some positions from the factory?
Yes. The chart shows LED-type fitment for the center high mount stop light, daytime running light, and stepwell light. That means some lighting positions are not standard halogen bulb replacements.
Why does the bulb size sometimes differ by trim or market?
Trim level, lighting package, body style, and regional specification can change the bulb used in a given position. That is why the page is organized by lighting location instead of only by a single general bulb list.
Can I replace factory halogen bulbs with LED bulbs on this car?
In some positions, aftermarket LED replacements may fit physically, but compatibility depends on the housing, connector, and vehicle electronics. If you convert from halogen to LED, check for proper beam pattern, warning messages, and legal use in your area.
How should I confirm the correct bulb before ordering?
Use the bulb chart for the exact lighting position, then compare it with the bulb already installed in your vehicle. If the car has been modified or the lighting package is different from stock, the installed bulb is the best final check.
Are the courtesy light bulb sizes the same on every 2009 Audi S4?
Not always. This page shows two courtesy light applications, one using 2825 or 98 and another using 6418. That is why it is important to match the bulb to the exact lamp location rather than assuming all courtesy lights are identical.