Mercedes-Benz Metris Tail Light Bulb Size

The Mercedes-Benz Metris tail light utilizes a P21W bulb size for illumination within the rear housing assembly. Data for the specified component covers the range from 2016 through 2023.

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

Other Locations

Additional Notes

The Mercedes-Benz Metris uses the P21W bulb size across all tail light positions for the 2016-2023 model years.
The P21W is an ECE-standardized bulb type, meaning it conforms to European and internationally recognized automotive lighting regulations rather than SAE standards used in North American domestic applications.
P21W bulbs operate on a 12-volt electrical system and draw 21 watts, which places them in the single-filament category used for dedicated stop or turn signal functions rather than combined stop/tail applications.
The BA15s designation refers to a bayonet-style base with a 15mm collar and a single contact pin, which is a specific physical configuration that is not interchangeable with the BA15d double-contact variant despite sharing the same base collar size.
Because the P21W uses a single filament, it serves one lighting function per bulb, distinguishing it from dual-filament types such as the P21/5W, which handles two functions within a single housing.
The consistent P21W fitment across the entire 2016-2023 production span of the Metris means that tail light bulb replacement requirements remained unchanged throughout the vehicle's production run in that period.