Audi A3 Headlight Bulb Size

Audi A3 high beam headlight bulbs utilize D4S, D5S, or H8 size specifications, while low beam headlight bulbs require D4S, D5S, or D3S size configurations. The replacement chart covers 2006 through 2024 model years with corresponding bulb size data for each production period.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

Years	Bulb Size
2022-2024	D4S (With HID Headlamps)
2019-2021	H8 (Halogen, Gas discharge headlamp (D5/D7 system))
2019-2021	D5S (With HID Headlamps)
2017-2018	D3S (With HID Headlamps)
2014-2016	D3S (With HID Headlamps)
2014-2016	H15 (With Halogen Capsule Headlamps)
2009-2013	D3S (With HID Headlamps)
2009-2013	H7 (With Halogen Capsule Headlamps)
2006-2008	H7
2006-2008	H8 (For Vehicle With Bi-Xenon Headlights)

Low Beam Headlight

Years	Bulb Size
2022-2024	D4S (With HID Headlamps)
2019-2021	D5S (With HID Headlamps)
2009-2018	D3S (With HID Headlamps)
2009-2018	H7 (With Halogen Capsule Headlamps)
2008	H8 (For Vehicle With Bi-Xenon Headlights)
	D1S (With Adaptive HID Headlamps)
	D2S (With HID Headlamps)
	H11 (With Halogen Capsule Headlamps)
2007	H8 (For Vehicle With Bi-Xenon Headlamps)
	D1S (With Adaptive HID Headlamps)
	D2S (With HID Headlamps)
	H11 (With Halogen Capsule Headlamps)
2006	H8 (For Vehicle With Bi-Xenon Headlights)
	D1S (With Adaptive HID Headlamps)
	D2S (With HID Headlamps)
	H11 (With Halogen Capsule Headlamps)

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Mercury-free HID (xenon) discharge bulb with P32d-5 base, for projector-type housings. 42V, 35W.	D4S
ECE standard (Europe & worldwide). Single-filament halogen bulb with PGJ19-1 base. Also approved in the US. 12V, 35W.	H8
ECE standard (Europe & worldwide). HID (xenon) discharge bulb with PK32d-7 base, low-voltage compact type. 12V, 25W.	D5S
ECE standard (Europe & worldwide). Mercury-free HID (xenon) discharge bulb with PK32d-5 base and integral ignitor, for projector-type housings. 42V, 35W.	D3S
ECE standard (Europe & worldwide). Dual-filament halogen bulb with PGJ23t-1 base. 12V, 55W/15W.	H15
ECE standard (Europe & worldwide). Single-filament halogen bulb with PX26d base. Also approved in the US and Japan. 12V, 55W.	H7
ECE standard (Europe & worldwide). HID (xenon) discharge bulb with PK32d-2 base and integral ignitor, for projector-type housings. 85V, 35W.	D1S
ECE standard (Europe & worldwide). HID (xenon) discharge bulb with P32d-2 base, for projector-type housings. Requires external ignitor. 85V, 35W.	D2S
ECE standard (Europe & worldwide). Single-filament halogen bulb with PGJ19-2 base. Also approved in the US. 12V, 55W.	H11

Other Locations

Additional Notes

The D3S bulb is the most widely specified HID type across the Audi A3 headlight data, appearing in both high beam and low beam positions for model years 2009-2018. It operates at 42V and 35W, uses a PK32d-5 base with an integral ignitor, and is a mercury-free discharge bulb designed exclusively for projector-type housings.
The H7 bulb is the most frequently listed halogen type in these specifications, covering high beam and low beam roles across multiple years. It is a single-filament bulb rated at 12V and 55W with a PX26d base, and holds approval under ECE standards as well as in the United States and Japan.
The 2006-2008 Audi A3 low beam positions list up to four distinct bulb types per year, including D1S, D2S, H8, and H11, reflecting a notably high degree of headlamp system variation within a single model year.
The D1S and D2S bulbs, specified for 2006-2008 low beams, both operate at 85V and 35W, which is substantially higher than the 42V operating voltage of the D3S, D4S, and the 12V of the D5S. The D2S requires an external ignitor, while the D1S incorporates the ignitor within the bulb itself.
The H15 bulb, listed for the Audi A3 high beam position in 2014-2016 with halogen capsule headlamps, is a dual-filament type rated at 12V with a 55W main filament and a 15W secondary filament. Its PGJ23t-1 base is not shared by any other bulb type in these specifications, making it non-interchangeable with other halogen types listed here.
The D5S bulb, specified for 2019-2021 HID high beam and low beam positions, operates at a significantly lower voltage and wattage than other HID types in these specifications, rated at 12V and 25W. Its PK32d-7 base is unique among the discharge bulbs listed and is not compatible with housings designed for D3S or D4S fitment.
Several years in the specifications list both an HID bulb type and a halogen alternative for the same beam position, indicating that the headlamp system installed on a given vehicle determines which bulb applies. Substituting one type for the other is not supported by the fitment data, as each corresponds to a distinct and incompatible housing design.
The H8 bulb appears in both high beam and low beam positions across multiple years, though its application context differs. In 2006-2008 high and low beam entries it is associated with bi-xenon headlight systems, while in 2019-2021 high beam entries it is paired with the D5/D7 gas discharge system as a halogen complement. It is a single-filament bulb rated at 12V and 35W with a PGJ19-1 base.