Mercedes-Benz C280 Back Up Light Bulb Size

The Mercedes-Benz C280 back up light utilizes a P21W bulb size for illumination. Data for the specific component covers the range from 1994 through 2007.

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
2006-2007	P21W
1994-2000	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The Mercedes-Benz C280 uses the P21W bulb size across all listed model years for the back up light position.
The P21W is an ECE-standardized bulb type, meaning it conforms to European and internationally recognized automotive lighting regulations rather than SAE standards common in North American markets.
P21W bulbs operate at 12 volts with a 21-watt output, which is a typical rating for single-filament signalling applications such as reverse lights.
The P21W uses a BA15s bayonet base, where "BA15" refers to the 15mm base width and the lowercase "s" denotes a single contact at the base, distinguishing it from dual-contact variants.
Because the P21W is single-filament, it serves one lighting function only, which is consistent with its use in a dedicated back up light rather than a combined stop and tail application.
The BA15s base is not interchangeable with the BA15d base, as the dual-contact version requires a second electrical contact that the single-contact socket does not provide.
The C280 back up light specification covers the 1994-2000 and 2006-2007 model years, all calling for the same P21W fitment.