Mercedes-Benz Metris Brake Bulb Size

The Mercedes-Benz Metris brake utilizes a P21W bulb size for illumination. Available data covers a range from 2016 through 2023 for the specified vehicle components.

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
2016-2023	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 P21W is the brake bulb size specified for the Mercedes-Benz Metris across all listed model years, 2016-2023.
The P21W is a single-filament bulb, meaning it serves one lighting function rather than combining two functions within a single unit, as dual-filament bulbs do.
The P21W operates at 12 volts and 21 watts, which places it within the standard low-voltage electrical architecture used in passenger and light commercial vehicles.
The bulb uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single central contact pin at the base, distinguishing it from the dual-contact BA15d variant.
The P21W is governed by ECE (Economic Commission for Europe) standards, a regulatory framework recognized across Europe and numerous other markets worldwide.
Because the BA15s base is a single-contact design, it is not interchangeable with the BA15d base, which carries two contacts and is typically found on dual-filament applications such as combined stop and tail bulbs.