See also:

Changing
WARNING Connect and disconnect the positive and negative cables in the correct sequence. ...

Disconnecting an external device
The external device is automatically disconnected from the audio system if it is moved out of range. ...

Unleaded fuel
Each Volvo has a three-way catalytic converter and must use only unleaded gasoline. U.S. and Canadian regulations require that pumps delivering unleaded gasoline be labeled "UNLEADED". ...