My 2009 XF showed that the key fob battery was low, so I changed it.....About a week later the car now says no key fob when I have it with me.... it sometimes works and other times doent work. I have another fob and it works great no problems at all any ideas??

 

This is a known fault. Jaguar will install new backs onto each fob for you under warranty. The one that works will eventually fail in the same way, it is a defect. The new back holds the battery in more firmly which corrects the false low battery fault.

 

thats what I thought the new battery is becoming loose.