Volkswagen e-Golf Back Up Light Bulb Size

The Volkswagen e-Golf back up light utilizes H21W and 921 bulb sizes for the specific lighting components located at the rear of the vehicle. Data for the provided bulb specifications covers the range from 2015 to 2019.

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
2019	H21W (Halogen, Without special body measures, Taillight assemblies, standard design)
2015-2018	921

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W.	H21W
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The Volkswagen e-Golf uses two distinct back up light bulb types across its model years: the H21W for 2019 and the 921 for 2015-2018.
The H21W is an ECE-standard halogen bulb rated at 12V and 21W, fitted with a BAY9s bayonet base and a single filament designed for signalling applications.
The 921 is an ANSI-standard wedge bulb in the T15 form factor, rated at 12V and 16W, and is the standard for the North American market.
The BAY9s base on the H21W is an offset bayonet mount, meaning it is not interchangeable with common single-contact bayonet bases such as the BA15s.
The 2019 Volkswagen e-Golf is specified with the H21W under a "without special body measures" condition and a standard taillight assembly design, indicating a fitment distinction tied to body configuration.
The H21W operates at 21W while the 921 operates at 16W, reflecting a difference in power draw that corresponds to their respective ECE and ANSI design standards rather than a shared specification.
The wedge base of the 921 and the BAY9s base of the H21W are physically incompatible socket types, making cross-substitution between the two bulbs impossible without modification.