Audi SQ7 Tail Light Bulb Size

The Audi SQ7 tail light requires a bulb size of 921 for the rear lighting assembly. Data for the specified vehicle covers the range from 2023 to 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	Bulb Size
2023-2024	921

Bulb Specifications

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

Other Locations

Additional Notes

The 921 bulb is the specified tail light bulb size for the Audi SQ7 across the 2023-2024 model years.
The 921 bulb follows the ANSI standard, which is the recognized specification framework used in the United States and Canada for automotive lighting components.
It is a wedge-type bulb, classified under the T15 designation. The T15 designation refers to the bulb's tubular shape, with the numerical portion indicating a width of 15 eighths of an inch across the envelope.
The 921 operates at 12 volts and draws 16 watts, which are standard electrical parameters consistent with typical automotive low-voltage systems.
The wedge base design means the bulb is held in place by tension from the socket contacts rather than a bayonet or screw mechanism, making socket compatibility a relevant factor when substituting equivalent bulbs.