Jaguar XJ6 front fog light bulbs utilize H3 and H2 sizes, while rear fog light bulbs use P21W size specifications. The replacement chart covers vehicle production years spanning 1981 to 1997 with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jaguar XJ6 front fog lights use two distinct bulb types across the model's production span: the H2 for 1981-1994 and the H3 for 1995-1997.
Both the H2 and H3 are single-filament halogen bulbs rated at 12V and 55W, meaning they share identical voltage and wattage output despite being different bulb types.
The H3 bulb uses a PK22s base and holds ECE approval for use in Europe, the US, and Japan, making it a current-production standard halogen type.
The H2 bulb uses an X511 base and, while it carries ECE standard origins, it is classified as obsolete and is no longer approved for fitment on new vehicles.
Because the H2 and H3 use different base designs, the PK22s and X511 are not interchangeable, and a direct substitution between the two types is not possible without modification to the housing.
The rear fog light on the Jaguar XJ6 uses the P21W bulb for 1995-1997, a single-filament signalling bulb rated at 12V and 21W.
The P21W uses a BA15s bayonet base, a fitting type common across a wide range of signalling and indicator applications in ECE-compliant vehicles.
At 21W, the P21W operates at less than half the wattage of the H2 and H3 fog bulbs, which reflects its role as a signalling lamp rather than a forward-projecting illumination source.