Audi S5 Sportback Headlight Bulb Size

Additional Notes

• The Audi S5 Sportback uses three distinct bulb types across its high beam and low beam headlight positions: the 9006, H8, and D5S, each belonging to different international standards and operating on different technologies.
• The D5S is the low beam bulb for the Audi S5 Sportback across the 2019-2024 model years. It is an HID (xenon) discharge bulb rated at 12V and 25W, using a PK32d-7 base, and it conforms to the ECE standard used in Europe and worldwide.
• The 2019 model year low beam fitment is noted specifically for vehicles equipped with HID headlamps, indicating that not all 2019 S5 Sportback configurations necessarily share the same low beam bulb type.
• The high beam bulb changed from the H8 to the 9006 between the 2021 and 2023 model years. These two bulb types are not interchangeable, as they use different base designs and operate at different wattages.
• The 9006 is an ANSI-standard single-filament halogen bulb with a P22d base, rated at 12V and 55W. It is the high beam bulb for the 2023-2024 S5 Sportback.
• The H8 is an ECE-standard single-filament halogen bulb with a PGJ19-1 base, rated at 12V and 35W. It serves as the high beam bulb for the 2019-2021 S5 Sportback, and while it originates from the ECE standard, it also carries approval for use in the United States.
• The 9006 and H8 are both single-filament halogen bulbs, but their base types differ entirely. The P22d base of the 9006 and the PGJ19-1 base of the H8 are physically incompatible, making substitution between them impossible without modification.
• The H8 operates at 35W, which is 20W lower than the 9006 at 55W. This difference in power draw reflects a meaningful distinction in electrical load on the vehicle's lighting circuit.
• The 2019 high beam position lists both Halogen and Gas discharge headlamp (D5/D7 system) as possible configurations alongside the H8 bulb size, indicating that the 2019 model year was available with more than one headlamp system type.
• The D5S, as a low-voltage compact HID type, operates at 25W, which is considerably lower than either halogen high beam option. HID technology produces light through an electrical arc between electrodes in a xenon gas-filled chamber, rather than through a heated filament as in halogen bulbs.