What Size Bulbs Does a 2009 Audi S5 Use?
Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.
Installation Difficulty
Hard (Tight clearances)
Est. Replacement Cost
$50 - $150 (HID System)
What Lighting System Does the 2009 Audi S5 Have?
The 2009 Audi S5 features an extensive lighting system with 12 bulb positions. It uses factory HID/Xenon technology with D3S projector headlights. The S5 has been available from 2008 to 2019, and the 2009 model falls in the early-generation years. As a Audi vehicle, it uses a CANbus electrical system that monitors bulb status.
LED Flicker Warning
This vehicle (Audi) is known to use a CANbus system that checks for burnt-out bulbs. Installing standard LEDs may cause them to flicker or trigger a dashboard error.
We highly recommend using a CANbus decoder or "Anti-Flicker" resistors.
Can You Put LED Bulbs in a 2009 Audi S5?
The 2009 Audi S5 comes equipped with factory D3S HID/Xenon headlights. These already produce significantly more light than halogen bulbs, so upgrading is generally unnecessary. When your HID bulbs burn out, replace them with OEM-spec D3S HID bulbs to maintain the correct color temperature and beam pattern. Avoid cheap aftermarket HID bulbs as they can produce incorrect beam patterns and blind oncoming drivers. Your fog lights use a H11 LED halogen bulb, which can be upgraded to LED for a whiter color match with your HID headlights.
How to Replace Bulbs on a 2009 Audi S5
To remove the headlight bulb, disconnect the wiring harness, then twist the bulb counter-clockwise and pull it straight out of the housing. Audi vehicles are known for tight engine bay clearances around the headlight assembly. You may need to remove the air intake duct, battery cover, or wheel well liner to access the bulbs. Budget 30 to 45 minutes per side for your first replacement. HID headlights operate at high voltage. Always disconnect the battery before working on the headlight assembly. Never touch the HID ballast while the headlights are on, and handle the D3S capsule with gloves to avoid oil contamination. The fog lights are accessed from underneath the front bumper. You may need to remove a few plastic clips or screws from the fender liner to reach the H11 LED fog light socket.
Full Upgrade Bundle
Upgrade All 12 Positions at Once
2009 Audi S5 Complete Bulb Size Chart
| Position | Bulb Size | Shop |
|---|---|---|
Low Beam | HID-D3S LED | Buy HID-D3S LED |
High Beam | HID-D3S LED | Buy HID-D3S LED |
Fog Light | H11 LED | Buy H11 LED |
Brake Light | LED Bulb | Buy LED Bulb |
Side Marker | LED Bulb | Buy LED Bulb |
Turn Signal Front | 64136 LED | Buy 64136 LED |
Turn Signal Rear | 921 LED | Buy 921 LED |
Dome Light | 6418 | Buy 6418 |
License Plate | 6418 | Buy 6418 |
Parking Light | 2825 | Buy 2825 |
Reverse Light | 921 | Buy 921 |
Trunk Light | 2825 | Buy 2825 |
Want to upgrade everything at once?
Shop Complete LED Kit for 2009 Audi S5How Long Do 2009 Audi S5 Headlight Bulbs Last?
HID/Xenon headlights on the 2009 Audi S5 typically last 2,000 to 3,000 hours, or about 4 to 6 years of regular driving. As HID bulbs age, they shift color toward pink or purple, which is a clear sign that replacement is needed. Flickering on startup also indicates a worn bulb or failing ballast. At 17 years old, the original bulbs on your S5 are likely overdue for replacement. Even if they still illuminate, reduced brightness significantly impacts nighttime safety. When one headlight burns out, replace both sides at the same time. Bulbs from the same batch age at similar rates, and mismatched brightness is distracting to oncoming drivers.
What Bulbs Are Compatible with the 2009 Audi S5?
Using the wrong bulb size can cause improper beam patterns that reduce your visibility and blind other drivers. It can also cause overheating inside the headlight housing, potentially warping the plastic lens or reflector. Always verify the bulb number before purchasing.
2009 Audi S5 Headlight FAQ
Did Audi S5 Bulb Sizes Change Over the Years?
Over its production run from 2008 to 2019, the Audi S5 has seen bulb size changes in the Low Beam, High Beam and Fog Light positions. The 2009 model uses the earlier bulb specification that was in place before the change around 2018. Always verify the exact bulb size for your specific 2009 model year using the chart above, as using the wrong size can result in poor fitment or reduced light output.
Other S5 Years
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Other Vehicles That Use HID-D3S LED Bulbs
These vehicles from other makes also use a HID-D3S LED low beam bulb: