hi prob just needs the fob recodeing!
put you key into your cars igntion and turn till all the lights come on (dont start the car)
take your key out and hold your finger down on the lock button of your fob, whilst holding lock use another finger and press unlock 3 times, do this in around 30secs your car should unlock and lock itself and you then should be able to lock and unlock your car using your fob!