I have a XJ8 LWB 85,000Km when turn key to system check get several warnings such as Fail safe engine mode,coolant level low, gearbox fail Traction fail, ASC not available

Disconnect battery for 5 minutes reconnect and start car.It worked for me everything is ok

If you are getting multiple warnings on instrument cluster on dash lit and the gauges are not working yet car is running "fine" it sounds like a electrical poor pin connection issue. Eventually car may not restart if worsens. Read Jaguar service technical bulletin xj413-02 Amended version 2/05 to see if symptoms match along with repair solutions.

Yes car stopped and would not proceed disconnected battery for 10 minutes reconnected car started and is running fine but am going to take it to a Jaguar mechanic for complete check over. The car had not been driven for nearly a year but has always been on a trickle chager

I have done what you said, but the problem is not over and i cant start the car up

Anyone have any luck? I've got same problem, dash lights up, but wont turn over