What is the low beam headlight bulb size for a 2009 Audi A3?

The 2009 Audi A3 uses a H7 LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2009 Audi A3?

The high beam bulb size for the 2009 Audi A3 is H7 LED.

Why are my 2009 Audi A3 headlights dim?

Dim headlights on a 2009 Audi A3 can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H7 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2009 Audi A3 fog light?

The 2009 Audi A3 uses a H11 LED bulb for the fog light position.

Is the 2009 Audi A3 single or dual beam?

The 2009 Audi A3 uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Can I install LED bulbs on my 2009 Audi A3?

Yes, the 2009 Audi A3 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H7 LED LED conversion kit for the low beams.

Does the 2009 Audi A3 have fog lights?

Yes, the 2009 Audi A3 takes a H11 LED bulb for the fog light position.

How do I change the headlight on a 2009 Audi A3?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old H7 LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. Note: Audi vehicles use a CANbus system, so LED replacements may need an anti-flicker decoder. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2009 Audi A3?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved H7 LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2009 Audi A3 headlights?

A pair of halogen H7 LED bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2009 Audi A3?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the H7 LED position are available as direct plug-and-play replacements. Since the Audi uses CANbus monitoring, choose a CANbus-compatible LED kit to avoid dashboard errors.

Fitment Guaranteed for 2009 Audi A3

What Size Bulbs Does a 2009 Audi A3 Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Hard (Tight clearances)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2009 Audi A3 Have?

The 2009 Audi A3 utilizes a refined lighting configuration featuring 12 distinct bulb positions. It features an extensive lighting system powered by a halogen-based setup where a single H7 LED dual-filament bulb handles both low and high beam duties within the same reflector. This model belongs to the early years of the A3's 2006-2019 production span. Note that Audi vehicles typically feature a CANbus electrical monitor that checks for specific bulb resistance.

LED Flicker Warning

This vehicle is known to use a CANbus system. Installing standard LEDs may cause flickering.

Use a CANbus decoder.

Can You Put LED Bulbs in a 2009 Audi A3?

Upgrading to LED is one of the most effective ways to modernize your Audi's appearance and safety profile. Since your A3 uses a single H7 LED bulb for both high and low beams, ensure your chosen LED kit is "dual-beam" compatible. This allows the LED circuitry to mimic the two-filament design of the original halogen bulb. Because Audi utilizes a CANbus system, standard LED bulbs may cause "bulb out" errors on your dashboard. Always opt for "Error-Free" or CANbus-ready kits which include the necessary resistors. Don't forget the H11 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2009 Audi A3 Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H7 LED	Buy H7 LED →
High Beam	H7 LED	Buy H7 LED →
Fog Light	H11 LED	Buy H11 LED →
Brake Light	Brake Light Assembly	Buy Brake Light Assembly →
Dome Light	6411	Buy 6411 →
Turn Signal Front	12188NA	Buy 12188NA →
License Plate	6418	Buy 6418 →
Map Light	47830	Buy 47830 →
Parking Light	2825	Buy 2825 →
Turn Signal Rear	12496	Buy 12496 →
Reverse Light	921	Buy 921 →
Trunk Light	2825	Buy 2825 →