Audi RS5 Back Up Light Bulb Size

The Audi RS5 back up light requires a bulb size of 921 for the rear lighting assembly. Data for the specified component covers the range from 2013 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

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 back up light bulb for the Audi RS5 across the 2013-2015 model years.
The 921 is classified as a T15 wedge-type bulb, meaning it uses a plastic wedge base rather than a metal pin or bayonet fitting, and seats directly into a matching socket without a separate holder.
The 921 operates at 12 volts and draws 16 watts, which is consistent with standard automotive electrical systems.
The 921 carries an ANSI designation, indicating it conforms to a standardized specification recognized in both the United States and Canada.
The T15 wedge form factor is shared across many automotive applications, though fitment compatibility depends on the specific socket design of the vehicle, and substitutions should be verified against the original specification before use.