Mercedes-Benz 260E Back Up Light Bulb Size

The Mercedes-Benz 260E back up light requires a P21W bulb size for proper installation and function within the lighting assembly. Data for the specific bulb covers the range from 1987 through 1989.

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
1987-1989	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 P21W is the sole bulb type listed for the Mercedes-Benz 260E backup light across the 1987-1989 model years.
The P21W is an ECE-standard single-filament bulb rated at 12 volts and 21 watts, designed for signalling applications such as backup lights.
It uses a BA15s bayonet base, which is a single-contact bayonet fitting. This base type is not interchangeable with double-contact bayonet variants such as the BA15d, despite their similar physical appearance.
The ECE designation indicates the P21W conforms to European and international regulatory standards, reflecting the 260E's European market origins.