The Jaguar XJ is the name of a series of flagship, full-size, luxury cars sold by the British automobile company, Jaguar. The XJ line has had a long history, with the first model released in 1968. At that time, there was no need for keyless entry remote fob smart key programming instructions, as the keyless entry remote fob smart key option was not yet available. As it became available, some model years had keyless entry remote fob smart keys that are onboard programmable, meaning a person can program the keyless entry remote fob smart key with no special equipment. However, other model years are not onboard programmable and require special equipment in order to program the keyless entry remote fob smart key.