Audi Allroad Back Up Light Bulb Size

The Audi Allroad back up light uses a 921 LED bulb size for replacement applications. The replacement chart covers vehicle production years spanning 2013 to 2017 with corresponding bulb specifications.

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
2017	LED
2013-2016	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 size for the Audi Allroad backup light across the 2013-2016 model years.
The 921 follows the ANSI standard, which is the recognized bulb classification system used in the United States and Canada.
It is a wedge-style bulb, classified under the T15 designation, which refers to its tubular shape and base type that seats by friction rather than by a bayonet or screw mechanism.
The 921 operates at 12 volts and draws 16 watts, which is consistent with standard automotive low-power incandescent applications.
The 2017 Audi Allroad uses an LED backup light rather than the 921 incandescent bulb specified for earlier model years.
The transition to LED in the 2017 model year represents a factory-integrated lighting system, which typically means the light assembly itself contains the LED unit rather than a replaceable bulb of a standard size.
The 921 and the LED fitments are not interchangeable, as the 2017 LED configuration does not share the wedge socket interface required by the 921 bulb.