hi all , i just bought a 1999 V reg Ford Focus , when i bought it the guy said the battery was dead in the Key Fob , so i changed the battery and still not working , but i been to a Key shop today and there is a signal coming from the key , and they also tryed to Sync it with the car about 6 times , but still not working , i can open the car with the key, drivers + passanger side but its as the the central locking is not working , can any 1 please help

Thx All