Hello,
I have a S type 3.0 litre V6, 2000 model.

my battery recently died and I used a jump cable to start it from another car. The car started and I drove it for 30 mins. When I turned the car off and after a little while tried starting it again, the car wouldn’t start, only the red immobilizer light is flashing. I tried replacing the batter but no different. While the car cranks fuel from the tank isn’t being pumped to the engine, I even replaced the pump and sender under the seat but no difference. Can someone please suggest what this could mean?

 

Try this tip from a previous (old) discussion on this forum
https://www.jaguarforums.com/forum/g...d-first-30792/

 

YUGE clue right there. Here's how the light is supposed to behave if all is good and no faults are present:

First, lock the car with the key fob. Press the lock button a second time to set the alarm system. The horn should chirp once. Watch the little red light. It should flash once every few seconds or so to show the system is armed. Now press the key fob unlock button twice to unlock all the doors. The red light should go out. Now hop in the driver's seat and turn the key to RUN (Not start yet). The red light should come on solid ONCE for about 3 seconds and then go out. If it flashes anything after that, you've got a stored fault and the security system may have inhibited the starter and/or fuel pump.

Please tell us what code is flashing and hopefully we can help.