Jaguar X-Type front fog light bulbs use H11 and H1 sizes, while rear fog light bulbs use P21W size. The replacement chart covers vehicle production years from 2002 to 2008 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jaguar X-Type front fog light uses two different bulb types depending on the model year, with H1 fitted to 2002-2003 models and H11 fitted to 2004-2008 models.
The H11 and H1 bulbs are not interchangeable despite sharing identical voltage and wattage ratings of 12V and 55W, as each uses a physically distinct base type.
The H11 uses a PGJ19-2 base, while the H1 uses a P14.5s base, making socket compatibility the primary factor separating the two front fog light fitments across the X-Type production run.
Both the H11 and H1 are single-filament halogen bulbs operating under the ECE standard, with approval for use in Europe, worldwide markets, and the United States.
The H1 also carries approval for use in Japan, a distinction not shared by the H11 within these specifications.
The Jaguar X-Type rear fog light uses the P21W bulb across all model years from 2002-2008, representing the only bulb position with no change in specification throughout the vehicle's production span covered here.
The P21W is a single-filament signalling bulb rated at 12V and 21W, operating at a significantly lower wattage than the halogen fog light bulbs used at the front.
The P21W uses a BA15s bayonet base, a fitting type mechanically distinct from the pin-style bases found on both the H11 and H1, which prevents cross-position substitution.
The BA15s designation on the P21W indicates a single-contact bayonet cap with a 15mm collar, a common format in automotive signalling applications.
All three bulb types specified for the X-Type fog lights conform to ECE regulations, reflecting the vehicle's European market origins.