My jag sovereign 4.2 v8 2001 was fine last time I used it . I only started it to move it off my drive and back on again a while later, and when I've gone to use it today it won't fire up... It cranks

SOURCE: Can not access my 1990 Jaguar soveriegn due to flat battery

the key should open the door without any batt power central locking is batt , the key should open both front doors!!owered so it should not be a problem !

SOURCE: Flat battery

Get a set of jumper cables. Positive side of the battery goes to the + side or red. and negative goes to - or black. Do the same on the other car. let it charge for awhile before attempting to start

SOURCE: 93 jag xj6won't start

Or the fuel pump relay in the trunk is shot. Replace the holder too if you have the time.

SOURCE: Oils pressure gauge fluctuates

check the oil viscosity,it might be too old(driven for toomany miles)..

if thats not ityou might need to get the oil preasure lubricating pump checked,and id suggest you do it fast or theres a lot of engine wear and tear.

SOURCE: Failing Instrument Module Jaguar 1994 4.0l Sovereign

Wiring info.