The Jaguar X-Type side marker requires a 12961 bulb size for proper installation and function within the lighting assembly. Data for the specified vehicle covers the range from 2002 to 2008.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jaguar X-Type uses the 12961 bulb across all front and rear side marker positions for the 2002-2008 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base.
The T10 designation refers to a tubular bulb roughly 10mm in width, commonly found in low-intensity automotive lighting applications such as side markers and parking lights.
The W2.1x9.5d base is a wedge-type base, meaning the bulb is held in its socket by the tension of the base itself rather than by a bayonet or screw mechanism.
The 12961 operates at 12 volts and 5 watts, placing it in the low-wattage category typical of marker and courtesy lighting rather than primary illumination.
Because the Jaguar X-Type uses the same 12961 bulb for both front and rear side markers, a single bulb type serves all four side marker positions on the vehicle.
The W2.1x9.5d base is a standardized wedge specification, so the 12961 is interchangeable with other T10 wedge bulbs sharing that base type and matching the 12V, 5W electrical rating.