See also:

Secondary control
For mechanically locking and unlocking the doors in the event of a fault with the central locking system or a battery failure. ...

A few definitions
Range (miles or km) This indicates the distance which can still be travelled with the fuel remaining in the tank in relation to the average fuel consumption over the last few miles (kilometres) ...

Monitoring
Instrument panel A. With the ignition on, the fuel gauge needle should indicate the level of fuel remaining. B. With the engine running, its associated low level warning lamp should go off. C. ...