Audi S4 Headlight Bulb Size

Additional Notes

• The D3S bulb is the most consistently specified type across the Audi S4 headlight records, appearing in both high beam and low beam positions for the 2009-2016 model years. It operates at 42V and 35W, conforms to ECE standards, and is a mercury-free HID discharge bulb with a PK32d-5 base and an integral ignitor designed for projector-type housings.
• The H8 is a halogen bulb rated at 12V and 35W with a PGJ19-1 base. It draws notably less wattage than other halogen types in these specifications, such as the H7 at 55W and the 9005 at 65W, while still meeting both ECE and US approval standards.
• The D5S is a low-voltage HID type rated at 12V and 25W with a PK32d-7 base. Its 12V operating voltage distinguishes it from the D3S, D1S, and D2S types, all of which require significantly higher voltages to sustain their discharge arcs.
• The 2019 Audi S4 high beam position lists two separate bulb sizes, D5S and H8, each tied to a specific headlamp system. The D5S applies to vehicles fitted with HID headlamps, while the H8 applies to halogen or gas discharge headlamp configurations using the D5/D7 system. These two types are not interchangeable.
• The 2007-2008 model years each carry dual fitment entries for both high beam and low beam positions. D1S applies to HID-equipped vehicles and H7 applies to halogen capsule headlamp variants. The D1S operates at 85V with an integral ignitor, while the H7 operates at 12V, making the two electrically incompatible.
• The 2009 model year lists both D3S and 9005 for the high beam position, and both D3S and H7 for the low beam position. The 9005 is an ANSI-standard halogen bulb rated at 65W with a P20d base, while the H7 is an ECE-standard halogen bulb rated at 55W with a PX26d base. Neither is a substitute for the D3S, which is an HID type operating on a different electrical system.
• The 2000 Audi S4 low beam position specifies either H7 for halogen capsule headlamps or D2S for HID headlamps. The D2S differs from the D1S and D3S in that it requires an external ignitor rather than an integral one, and it uses a P32d-2 base operating at 85V and 35W.
• The 1992-1994 model years use ANSI-standard bulbs exclusively. The high beam position takes the 9005 and the low beam position takes the 9006. Both are single-filament halogen types operating at 12V, with the 9005 rated at 65W using a P20d base and the 9006 rated at 55W using a P22d base. Despite their similar designations, the two have different base types and wattage ratings and are not interchangeable.
• Across the specifications, HID bulb types including D1S, D2S, D3S, and D5S are each associated with specific base configurations and ignitor arrangements. The D1S and D3S carry integral ignitors, the D2S requires an external ignitor, and the D5S uses a distinct PK32d-7 base at a lower operating voltage. Substituting one HID type for another is not supported by these specifications.
• The high beam position for the 2023-2024 model years specifies the 9006, an ANSI halogen type, while the low beam position for the same years specifies the D5S, an HID type. This pairing means the two beam positions on the same vehicle operate on fundamentally different lamp technologies and electrical requirements.