Mini Cooper Countryman Brake Bulb Size

The Mini Cooper Countryman brake light utilizes a P21W bulb size for illumination. Data for the specified vehicle covers the range from 2011 through 2022.

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
2011-2022	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 Mini Cooper Countryman uses the P21W bulb type for the brake light position across the 2011-2022 model years.
The P21W is an ECE-standardized bulb, meaning it conforms to the Economic Commission for Europe regulatory framework used in European and worldwide automotive lighting applications.
P21W bulbs operate on a 12-volt electrical system and draw 21 watts, which is a standard wattage rating for single-filament signalling applications.
The P21W uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The single-contact design corresponds to the bulb's single-filament construction, making it suited exclusively for single-function roles such as braking signals rather than combined stop/tail functions.
Because the P21W is a single-filament bulb, it is not interchangeable with dual-filament variants such as the P21/5W, which shares a similar physical form but carries a second filament and a dual-contact BAY15d base. Substituting one for the other would result in incorrect fitment or non-functional wiring contacts.