Mercedes-Benz Sprinter Back Up Light Bulb Size

The Mercedes-Benz Sprinter back up light uses a P21W bulb size for the reverse lighting component. The replacement chart covers vehicle production years spanning 2010 to 2025.

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
2010-2025	P21W

Bulb Specifications

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

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Additional Notes

The Mercedes-Benz Sprinter uses the P21W bulb size for its back up light across the 2010-2025 model years.
The P21W is an ECE-standard bulb, meaning it conforms to the Economic Commission for Europe's regulations, which govern lighting equipment used in Europe and many markets worldwide.
P21W bulbs operate on a 12-volt electrical system and draw 21 watts, placing them in the mid-range of automotive signalling bulb wattage.
The P21W is a single-filament bulb, meaning it serves one lighting function only, which in this application is the reverse or back up light.
The P21W uses a BA15s bayonet base, where "BA" denotes a bayonet cap fitting, "15" refers to the 15mm base width, and the lowercase "s" indicates a single contact at the base.
The BA15s single-contact base is distinct from the BA15d double-contact base; substituting a double-contact bulb in a single-contact socket is not compatible and would prevent proper installation.
Because the P21W is an ECE-regulated type rather than an SAE-regulated type, it is more commonly found in European-market vehicles and may require sourcing from suppliers that stock European automotive lighting components.
The consistent use of the P21W across all sixteen model years of the Sprinter listed in these specifications means that a single bulb specification covers the entire range without variation by year.