Audi S5 Headlight Bulb Size

Additional Notes

• The D3S bulb is the most frequently specified type across the Audi S5 high beam and low beam positions, appearing in both functions from 2008 through 2018. It operates as a mercury-free HID xenon discharge bulb at 42V and 35W, uses a PK32d-5 base with an integral ignitor, and is designed for projector-type housings under the ECE standard.
• The D5S bulb replaced the D3S in the low beam position from 2019 onward on HID-equipped vehicles. Although both are HID xenon types, the D5S operates at a significantly lower voltage of 12V and a reduced wattage of 25W, using a PK32d-7 base rather than the PK32d-5 found on the D3S. These two bulbs are not interchangeable despite their shared discharge technology.
• For the 2023-2024 high beam position, the Audi S5 uses the 9006 bulb, a single-filament halogen type operating at 12V and 55W with a P22d base. This bulb follows the ANSI standard applicable in the US and Canada.
• The H8 bulb is specified for the high beam position in the 2019-2021 model years under certain configurations. It is a single-filament halogen bulb rated at 12V and 35W with a PGJ19-1 base, operating under the ECE standard. At 35W, it draws notably less power than the 9006 and H7 halogen types also present in these specifications.
• The 2019 and 2020 high beam positions carry conditional fitment notes. The 2020 entry specifies the H8 for all-weather light applications and for vehicles without special upgrade measures using a Gas discharge headlamp D5/D7 system, while the 2019 entry distinguishes between halogen and Gas discharge headlamp D5/D7 system configurations. These conditions indicate that multiple headlamp technologies were available within the same model year.
• For the 2013-2016 model years, the Audi S5 high beam position lists two separate bulb sizes: D3S as the primary fitment and H7 specifically for vehicles with xenon headlights. The H7 is a single-filament halogen bulb at 12V and 55W with a PX26d base. The coexistence of a xenon discharge type and a halogen type within the same model year and function reflects distinct headlamp system variants available during that period.
• The H7 and 9006 halogen bulbs share the same 12V and 55W electrical ratings but use different base types, PX26d and P22d respectively, making them physically incompatible with each other's housings despite identical power consumption.
• The D3S and D5S discharge bulbs share the same 35W wattage but differ in operating voltage, 42V for the D3S and 12V for the D5S, and use different base types. This voltage difference reflects a fundamental distinction in ignition and ballast system design between the two generations of HID technology.
• The low beam position on the Audi S5 shows no halogen fitment across any listed model year, with all entries specifying either D3S or D5S discharge bulbs. The high beam position, by contrast, includes halogen types across multiple years and configurations.
• The D3S carries an integral ignitor as part of its construction, distinguishing it from some other HID bulb types that rely on a separate ignitor within the ballast assembly. This integration affects replacement procedures, as the ignitor is replaced along with the bulb rather than independently.