Ski-Doo MX Z X Brake Bulb Size

Ski-Doo MX Z X brake bulb specifications indicate a P21/5W bulb size for this snowmobile model. The replacement chart covers 2011 through 2018 vehicle production years with corresponding bulb size data.

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
2011-2018	P21/5W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W

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Additional Notes

The P21/5W is the brake bulb type specified for the Ski-Doo MX Z X across the 2011-2018 model years.
The P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope. The higher-output filament operates at 21 watts and serves the brake or stop-light function, while the lower-output filament operates at 5 watts and serves a secondary signalling or tail-light function.
The bulb operates on a 12-volt electrical system, which is standard for this class of signalling application.
The P21/5W uses a BAY15d bayonet base. The BAY15d designation indicates an offset dual-contact base, where the two pins are positioned at different heights. This offset design prevents the bulb from being inserted in the wrong orientation, ensuring the correct filament is assigned to the correct circuit.
The P21/5W is classified under the ECE (Economic Commission for Europe) standard, indicating it conforms to internationally recognized regulations for vehicle lighting used across Europe and other adopting regions.
Because the BAY15d base uses offset pins, it is not interchangeable with the BA15d base, which has pins at equal heights. Substituting a BA15d bulb in a BAY15d socket would result in incorrect fitment.