Jaguar XKR Back Up Light Bulb Size

The Jaguar XKR back up light utilizes P21/5W and P21W bulb sizes for the rear illumination system. Data for the specified vehicle components covers the range from 2000 to 2015.

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
2007-2015	P21/5W
2000-2006	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The Jaguar XKR uses two distinct bulb types across its model years for the back up light position: the P21/5W and the P21W, both governed by ECE standards recognized in Europe and worldwide.
The P21W is a single-filament signalling bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and it serves the Jaguar XKR from 2000-2006.
The P21/5W is a dual-filament signalling bulb rated at 12V with filaments at 21W and 5W, fitted with a BAY15d bayonet base, and it serves the Jaguar XKR from 2007-2015.
The BA15s and BAY15d bayonet bases are physically incompatible with each other. The BAY15d base features two offset pins, while the BA15s base uses two pins at the same height, preventing cross-installation between the two bulb types.
Despite both bulb types sharing a 21W primary filament rating, the P21/5W carries an additional 5W filament, making it a non-interchangeable replacement for the P21W used in earlier model years.
The transition from P21W to P21/5W in the Jaguar XKR occurred between the 2006 and 2007 model years, representing a change in both base type and filament configuration for the back up light position.