Audi Q7 Headlight Bulb Size

Additional Notes

• The H7 bulb is the most frequently specified type across the Audi Q7 high beam headlight positions, appearing across multiple model years from 2007 through 2024. It is a single-filament halogen bulb rated at 12V and 55W, fitted with a PX26d base, and carries ECE approval for use in Europe, the US, and Japan.
• The D5S is an HID xenon discharge bulb rated at 12V and 25W, using a PK32d-7 base. It is classified as a low-voltage compact type and holds ECE standard approval. It serves as the low beam bulb for the Q7 in 2021-2024 and appears in both high and low beam positions for 2018-2019 HID-equipped configurations.
• The D3S is a mercury-free HID xenon discharge bulb rated at 42V and 35W, with a PK32d-5 base and an integral ignitor. It is designed for projector-type housings and carries ECE standard approval. It is specified for both high and low beam positions on Q7 models from 2010-2015 with HID headlamps.
• The D1S is an HID xenon discharge bulb rated at 85V and 35W, fitted with a PK32d-2 base and an integral ignitor, also intended for projector-type housings. It is specified for both high and low beam positions on Q7 models from 2007-2009 with HID headlamps.
• The H15 is a dual-filament halogen bulb rated at 12V with a 55W main filament and a 15W secondary filament, using a PGJ23t-1 base. On the Audi Q7, it is specified for the high beam position on halogen capsule headlamp configurations from 2010-2012, as well as on vehicles without Xenon headlights in 2015.
• The H8 is a single-filament halogen bulb rated at 12V and 35W with a PGJ19-1 base, carrying ECE approval and additional US approval. On the Q7, it is specified for the low beam position specifically on 2013-2015 vehicles equipped with Xenon headlights and LED daytime running lights, representing a distinct fitment condition separate from the D3S discharge bulb used in the same years.
• Several model years of the Audi Q7 carry multiple valid bulb specifications for a single headlight position, reflecting different factory headlamp system configurations. The 2019 high beam position, for example, accepts either a D5S for HID-equipped vehicles or an H7 for halogen and gas discharge D5/D7 system variants, making headlamp system identification a prerequisite for correct bulb selection.
• The 2015 Audi Q7 high beam position is specified with three distinct bulb types: D3S, H7 for vehicles with Xenon headlights, and H15 for vehicles without Xenon headlights. This reflects a particularly broad range of factory configurations within a single model year.
• The D3S and D1S bulbs both incorporate integral ignitors within the bulb unit itself, which distinguishes them from some other HID types that rely on external ignitor components. This construction is relevant to housing compatibility, as projector-type housings are specified for both types across the Q7 fitment data.
• The transition from D1S to D3S across Q7 high and low beam specifications between the 2009 and 2010 model years reflects a shift between two HID types that share a 35W rating but differ significantly in operating voltage, with the D1S running at 85V and the D3S at 42V. These types use different base configurations and are not interchangeable.