If one of the remote control keysApplies to remote control key with PCC (Personal Car Communicator). has been left in the car then the Keyless functionality is deactivated in case the car is e.g. locked with the other remote control key that belongs to the car. This prevents unauthorised entry.
The next time the car is unlocked with the other remote control key the forgotten remote control key is reactivated again.
Avoid leaving the remote control key with PCC behind in the car. If someone breaks into your car and takes the remote control key, it will e.g. be possible to start the car by pressing the remote control key in the ignition switch and then pressing the START/STOP ENGINE button.