Jaguar XKR-S Back Up Light Bulb Size

The Jaguar XKR-S back up light requires a P21/5W bulb size for proper installation and function. Available data for the specified component covers the range from 2012 through 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
2012-2015	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 Jaguar XKR-S uses the P21/5W bulb for its back up light across the 2012-2015 model years.
The P21/5W is an ECE-standard bulb, meaning it conforms to the Economic Commission for Europe's regulations, which govern lighting equipment used in European and many worldwide markets.
This bulb is a dual-filament type, housing two separate filaments within a single glass envelope. The two filaments operate at different wattages, rated at 21W and 5W respectively.
The P21/5W operates on a 12V electrical system, which is standard for passenger vehicles of this type.
The bulb uses a BAY15d bayonet base. The BAY15d designation indicates an offset twin-pin base, where the two pins are positioned at different heights to ensure the bulb can only be inserted in one orientation, preventing incorrect filament alignment.
Because the BAY15d base is offset, it is not interchangeable with the BA15d base, which shares the same pin spacing but uses pins at equal heights. Substituting one for the other is not possible without modification.