DJS

I own a Jaguar X type 2L Diesel 08 model.  My key will unlock boot and will unlock car but does not lock the car, changed to a new battery no difference, reprogrammed it still exactly the same problem. Tried my spare key and the exact same problem anybody got any ideas what's wrong 

today on driving my car down motorway it was slightly Kangarooing, my MPG dropped from 44 average to 33, smoking all the time some times light sometimes heavy and poor acceleration. would this be the Turbo or could it be something else. the vehicle is a 2008  Jaguar x type 2 litre.