The Audi S8 fog light requires a bulb size of H7 for the lighting assembly. Data for the specific bulb requirements covers the period from 2007 through 2007.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Audi S8 front fog light specifications cover model years 2001 through 2009, while rear fog light specifications apply to model years 2001-2003.
Three distinct front fog light bulb types appear across the listed years: H3 for 2001-2003, H7 for 2007-2008, and H11 for 2009. These types are not interchangeable due to differences in base design and physical form factor.
The H3, H7, and H11 bulbs are all single-filament halogen types operating at 12V and 55W, meaning they share identical power consumption despite having different base configurations.
The H3 bulb uses a PK22s base, the H7 uses a PX26d base, and the H11 uses a PGJ19-2 base. Each base type is physically distinct, which prevents cross-fitting between these bulb types.
All three front fog light bulb types conform to ECE standards, with approval for use in Europe, the US, and worldwide markets. The H7 and H3 types carry additional approval for Japan.
The Audi S8 (2001-2003) rear fog light uses the P21W bulb, which operates at 12V and 21W. This is a signalling bulb rather than a halogen illumination bulb, reflecting its functional role in rear visibility.
The P21W uses a BA15s bayonet base, a single-contact fitting that is mechanically incompatible with the push-and-lock or pin-type bases found on the front fog light bulbs listed in these specifications.
The P21W also conforms to ECE standards with worldwide approval, consistent with the other bulb types listed across these specifications.