The Jaguar XKR-S front outer turn signal, front turn signal, and rear turn signal each require a PY21W bulb size, with the front turn signal also compatible with 12496. The replacement chart covers 2012 to 2015 model years and contains vehicle production years paired with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The PY21W is the dominant bulb type across the Jaguar XKR-S turn signal specifications, appearing in the front outer, front, and rear turn signal positions for the 2012-2014 model years, and in the front outer and rear positions for 2015.
The PY21W is an ECE-standard single-filament amber bulb operating at 12 volts and 21 watts, fitted with a BAU15s bayonet base. The BAU15s base features offset pins, which physically prevents substitution with standard BA15s-based bulbs.
The amber coloring of the PY21W is built into the glass envelope rather than applied as a coating, which is a defining characteristic of ECE-compliant signaling bulbs intended for worldwide markets.
The 21-watt rating of the PY21W is a deliberate specification for turn signal circuits, as many vehicles use wattage-sensitive flasher relays that regulate flash rate based on expected current draw. Substituting a bulb of a different wattage can alter flash frequency.
The 2015 Jaguar XKR-S front turn signal position departs from the PY21W specification used in 2012-2014, instead calling for the 12496 bulb, a Philips/Osram part number designating a halogen bulb for specialty applications at 12 volts.
Because the 12496 and PY21W carry different part number origins and base types, the two bulbs are not interchangeable despite both operating on 12-volt systems. The 2015 front turn signal position requires the 12496 specifically.