THE central door locking system enables the side doors and liftgate/trunk lid to be locked simultaneously. The side doors can be locked using the liftgate/trunk lid key. The engine immobiliser disables the fuel and ignition system if a thief attempts to use any key other than a Ford key. The use of a challenge and response system makes it extremely difficult to steal the car using a duplicate key. A steering shaft de-clutching device prevents the steering lock from breaking if a thief applies significant torque to the steering wheel. Central locking and keyless entry are optional.