Mini Cooper Back Up Light Bulb Size

The Mini Cooper back up light requires a bulb size of P21W for the specified lighting assembly. Data for the bulb size covers the range from 2020 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
2014-2024	P21W (w/o LED taillights)
2002-2013	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 uses the P21W bulb size for the back up light across all model years from 2002 to 2024.
The P21W is an ECE-standard single-filament bulb rated at 12 volts and 21 watts, designed primarily for signalling applications such as reverse lights.
The P21W uses a BA15s bayonet base, which is a single-contact bayonet fitting. This base type is not interchangeable with double-contact bayonet bases such as the BA15d.
For the 2015-2024 Mini Cooper, the P21W fitment applies only to vehicles without LED taillights. Models equipped with LED taillights use a different lighting system for that function.
The ECE designation on the P21W indicates the bulb conforms to United Nations Economic Commission for Europe regulations, a standard widely adopted outside North America.
Because the P21W is a single-filament bulb, it serves one lighting function per socket. It is not suited for dual-function applications that require a twin-filament bulb.