Mini Cooper Countryman Back Up Light Bulb Size

The Mini Cooper Countryman back up light requires a P21W bulb size for proper installation and function within the rear lighting assembly. Available data covers a range from 2011 through 2023 for the specified vehicle component.

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
2021-2023	P21W
2011-2019	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 P21W is the back up light bulb size across all specified model years of the Mini Cooper Countryman, spanning 2011-2023, with the exception of 2020, which is not present in the specifications.
The P21W is governed by ECE (Economic Commission for Europe) standards, a regulatory framework widely adopted across Europe and numerous other markets worldwide.
As a single-filament bulb, the P21W is dedicated to one lighting function, which in this application is the reverse light.
The P21W operates at 12 volts and consumes 21 watts, placing it in a mid-range output category typical of signalling and reversing applications.
The P21W uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin offset, distinguishing it from the dual-contact BA15d variant with which it is not interchangeable.
The BA15s base designation is critical for fitment; substituting a bulb with a BA15d or other bayonet base would result in an incompatible fit regardless of wattage or voltage rating.