Mercedes-Benz SLC43 AMG Back Up Light Bulb Size

The Mercedes-Benz SLC43 AMG back up light requires a bulb with the unique size 921 for proper installation and function. Data for the specified component covers the range from 2017 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
2017-2019	921

Bulb Specifications

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

Other Locations

Additional Notes

The Mercedes-Benz SLC43 AMG uses the 921 bulb for the back up light across the 2017-2019 model years.
The 921 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American industry standard applicable in both the United States and Canada.
The 921 bulb uses a wedge-style base, designated T15, which refers to a tubular lamp body approximately 15 eighths of an inch wide that is held in its socket by the tension of the base contacts 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-voltage electrical systems.
Because the 921 is an ANSI-standardized wedge type, direct-fit replacements from multiple manufacturers are generally available as long as they conform to the T15 wedge base and the 12V, 16W electrical rating.