Hello everyone my name is Clyde 👋 hope all is well.I have a 2005 jaguar xjr supercharged and recently changed my battery.I drove it the same day.The next day it wouldn't start or crank.Im just getting a flashing immobilizer security light.I have tried everything that google has said to do.If anyone has any ideas or had this problem before can you please lead me in the right direction.Thanks in advance

 

The first thing to do in these cases is to see whether there are fault codes. If you do not have a code reader, I suggest that you get one,or SDD, which is the Jaguar specific software.

Without an indication from fault codes,unfortunately it is pure guesswork.

Best regards,

Thomas