Abstract: A locking system includes an actuator which serves to control the engine and which can be moved between a home position associated with the parked state of the vehicle and at least one working position associated with the state in which the vehicle is being driven. An actuator blocking element normally secures the home position of the actuator. A locking bar of an anti-theft device of the vehicle, however, also belongs to the locking system. This locking bar can be changed between a release position and a locking position and is secured in its release position by a locking bar blocking element. A connection is provided between the actuator blocking element and the locking bar blocking element. This connection ensures that, when the locking bar blocking element is active, the actuator blocking element is inactive and, conversely, when the locking bar blocking element is inactive the actuator blocking element is active.