Audi TTS Quattro Headlight Bulb Size

Additional Notes

• The D1S bulb is the most frequently specified type across the Audi TTS Quattro headlight data, appearing in both high beam and low beam positions for the 2009-2015 model years. It is an HID (xenon) discharge bulb operating at 85V and 35W, built to ECE standards, and uses a PK32d-2 base with an integral ignitor designed specifically for projector-type housings.
• The H7 bulb shares fitment with D1S across the 2009-2012 model years, but only in vehicles equipped with halogen capsule headlamps rather than HID headlamps. H7 is a single-filament halogen bulb rated at 12V and 55W, using a PX26d base, and holds ECE certification with additional approval in the US and Japan.
• The 2009-2012 Audi TTS Quattro presents a dual-fitment condition in both high beam and low beam positions, where the correct bulb type depends entirely on whether the vehicle was built with HID or halogen capsule headlamps. Substituting D1S for H7, or vice versa, is not compatible due to fundamental differences in operating voltage, base type, and housing design.
• The D5S bulb is specified for low beam use in the 2021 and 2023 model years. It is a low-voltage compact HID (xenon) type operating at 12V and 25W, using a PK32d-7 base. Its lower wattage and distinct base configuration make it incompatible with D1S sockets despite both being HID discharge types.
• The 9006 bulb is specified exclusively for the high beam position in the 2023 Audi TTS Quattro. It follows the ANSI standard used in the US and Canada, operates at 12V and 55W, and uses a P22d base. Its single-filament halogen design and ANSI classification distinguish it from the ECE-standard halogen types used in other model years.
• The H8 bulb is specified for the high beam position in the 2020-2021 model years. It is a single-filament halogen bulb rated at 12V and 35W with a PGJ19-1 base, following ECE standards. At 35W, it draws significantly less power than the H7 and 9006 types, and its PGJ19-1 base is not interchangeable with the PX26d base of the H7 or the P22d base of the 9006.
• The 2023 Audi TTS Quattro uses two different bulb types across its high and low beam positions: the 9006 (ANSI halogen) for high beam and the D5S (ECE HID) for low beam. These two types operate on different technologies and voltage systems, meaning neither is a substitute for the other.
• Across the 2013-2015 model years, both the high beam and low beam positions share the D1S specification without any conditional fitment variants, indicating a standardized HID headlamp configuration for those years.
• The H8 and H7 bulbs, while both ECE-standard single-filament halogen types approved in the US, use different base fittings and wattage ratings. H8 uses a PGJ19-1 base at 35W, while H7 uses a PX26d base at 55W, making them physically and electrically non-interchangeable despite their similar general classification.
• The D1S and D5S bulbs both carry HID (xenon) discharge technology but are not interchangeable. D1S operates at 85V with a PK32d-2 base, while D5S operates at 12V with a PK32d-7 base. The difference in operating voltage alone makes cross-substitution between these two types incompatible.