Audi S6 Back Up Light Bulb Size

The Audi S6 back up light bulb size chart specifies 2 bulb sizes: 921 and 7506. The replacement chart covers vehicle production years from 1995 to 2015.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2013-2015	921
2007-2011	921
1995	7506

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 921 bulb is the back up light specification for the Audi S6 across the 2007-2015 model years, with the exception of 2012.
The 921 follows the ANSI standard, meaning it conforms to the American National Standards Institute's established electrical and dimensional criteria for automotive lighting in the US and Canadian markets.
The 921 is a T15 wedge-type bulb, a form factor in which the base tapers to a flat wedge that presses directly into a socket without requiring a separate bayonet or screw fitting.
The 921 operates at 12 volts and draws 16 watts, figures consistent with standard 12V automotive electrical systems.
The 1995 Audi S6 uses a 7506 bulb for the back up light, a specification distinct from the 921 used in later model years.
The 921 and 7506 are not the same bulb type, and the two are not interchangeable despite both being used in back up light applications across different S6 model years.