Audi A3 Sportback e-tron Headlight Bulb Size

Audi A3 Sportback e-tron headlight bulbs include high beam sizes H8, D5S, and D3S, along with low beam sizes D5S, D3S, and H7 for this model. The replacement chart covers 2016 to 2018 production years with corresponding bulb size specifications.

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
2017-2018	H8
2017-2018	D5S (With HID Headlamps)
2016	D3S (With HID Headlamps)
2016	H15 (With Halogen Capsule Headlamps)

Low Beam Headlight

Years	Bulb Size
2017-2018	D5S (With HID Headlamps)
2016	D3S (With HID Headlamps)
2016	H7 (With Halogen Capsule Headlamps)

Bulb Specifications

Description	Bulb Size
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

Other Locations

Additional Notes

The H8 bulb is a halogen type operating at 35 watts with a PGJ19-1 base. It is used in the Audi A3 Sportback e-tron as a high beam headlight bulb for the 2017-2018 model years in non-HID configurations.
The D5S is a discharge (HID) bulb that operates without a traditional filament, producing light through an electrical arc between two electrodes. It appears in both the high beam and low beam positions for the 2017-2018 model years when the vehicle is equipped with HID headlamps.
The D3S is also an HID discharge bulb and is distinguished from the D5S by its use of mercury in the arc tube. It is specified for the 2016 model year in both the high beam and low beam positions on vehicles fitted with HID headlamps.
The D3S and D5S are not interchangeable despite both being HID bulb types. They differ in igniter design and electrical characteristics, meaning a D5S cannot be substituted for a D3S and vice versa.
The H15 bulb is a dual-filament halogen type, with one filament serving a lower wattage function and the other a higher wattage function. It is listed as the high beam bulb for the 2016 model year on vehicles with halogen capsule headlamps.
The H7 is a single-filament halogen bulb with a PX26d base, rated at 55 watts. It is specified as the low beam bulb for the 2016 model year on vehicles equipped with halogen capsule headlamps.
The 2016 Audi A3 Sportback e-tron carried two distinct headlamp system configurations, halogen capsule and HID, each requiring a different set of bulb sizes across both the high beam and low beam positions.
For the 2017-2018 model years, the high beam position accommodates either an H8 or a D5S bulb depending on whether the vehicle has standard or HID headlamps, indicating that the two bulb types are not interchangeable between headlamp system types.