Audi Q7 Back Up Light Bulb Size

The Audi Q7 back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Available data covers a span of production from 2007 through 2024.

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	US Type	EU Type	Shop
2023-2024	921	W16W	Check Price
2018-2021	921	W16W	Check Price
2007-2015	921	W16W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

Other Locations

Additional Notes

The Audi Q7 uses the 921 bulb for its back up light across all listed model years from 2007 through 2024.
The 921 is a T15 wedge-base bulb, meaning it connects to its socket through a tapered plastic base rather than a metal pin or bayonet fitting.
The 921 operates at 12 volts and draws 16 watts, which places it in the mid-range of standard automotive incandescent output for reverse lighting applications.
The 921 carries ANSI standardization recognized in both the United States and Canada, meaning the specification is consistent across North American replacement parts markets.
Because the 921 is an ANSI-standardized wedge bulb, it is interchangeable with other bulbs sharing the T15 wedge base and the same 12V/16W electrical rating, provided the physical fit within the housing is confirmed.
The gap in listed years between 2015 and 2018 corresponds to a known generational change in the Q7, and both generations share the same 921 bulb specification for the back up light position.