I has a jaguar xf 2015 AWD and its all working fine till yesterday night when i came home from work and When i try to unlock the car in the morning. Car key nor working only the light button is working on the key. and when i get inside the car to turn it on . it saying key fob not found and try replacing the key fob. After this I even has replace key key batteries to new one but still jot working.

I already tried the spare key and putting the key near the steering whell column still ni difference.

 

You have to use Duracell or Energizer

 

thats the one i use ''Energizer''