Freightliner Sprinter Back Up Light Bulb Size

The Freightliner Sprinter back up light uses a P21W bulb size for replacement applications. The chart contains bulb size specifications across 2002 to 2021 vehicle production years.

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
2002-2021	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 Freightliner Sprinter uses the P21W bulb size for its back up light across all listed model years from 2002-2021.
The P21W is an ECE-standard bulb, meaning it conforms to regulations recognized across Europe and numerous other markets worldwide.
P21W bulbs operate on a 12-volt electrical system and draw 21 watts, which places them in the range of incandescent single-filament signal lighting.
The P21W uses a BA15s bayonet base, which is a single-contact bayonet fitting. The "s" in BA15s denotes a single contact point at the base, as opposed to the dual-contact BA15d variant.
Because the P21W is a single-filament bulb, it serves one lighting function only, making it suited for dedicated back up light housings rather than combined stop or tail light applications.
The BA15s bayonet mount is a widely distributed base type, meaning P21W replacements are generally available from multiple manufacturers in both incandescent and LED form factors.
When substituting an LED equivalent for the P21W in the Freightliner Sprinter, the replacement must retain the BA15s base to fit the factory socket correctly.
The consistent use of a single bulb specification across the 2002-2021 model range indicates that the back up light socket design remained unchanged throughout those years, which is relevant when sourcing replacement parts.