Mercedes-Benz Sprinter Dome Light Bulb Size

The Mercedes-Benz Sprinter dome light uses a 921 bulb size for interior illumination. The replacement chart covers vehicle production years from 2010 to 2018 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	US Type	EU Type	Shop
2010-2018	921 (Front)	W16W	Check Price

Bulb Specifications

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

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Additional Notes

The Mercedes-Benz Sprinter uses the 921 bulb size for the front dome light across the 2010-2018 model years.
The 921 is a wedge-type bulb, classified under the T15 designation, which refers to its tubular glass envelope measuring 15 eighths of an inch in width.
Wedge bulbs are named for their base design, where the glass pinches into a wedge shape that locks directly into the socket without a separate metal base or pins.
The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive low-voltage electrical systems.
The 921 bulb conforms to ANSI standards, meaning its physical and electrical specifications are standardized for the United States and Canada markets.
Because the 921 follows an ANSI-defined specification, units from different manufacturers are expected to share the same base type, voltage, and wattage, making cross-brand substitution possible within that standard.
The T15 wedge form factor is a common platform shared by several ANSI-coded bulbs, so installers should confirm the specific ANSI number rather than relying on the T15 designation alone when sourcing a replacement.