See also:

CHECK ENGINE Malfunction indicatorlight
On-Board Diagnostics II (OBDII): As you drive, a computer called "OBDII" monitors your vehicle's engine, transmission, electrical and emission systems. The CHECK ENGINE light will light ...

Coolant
Location of the coolant reservoir Normally, the coolant does not need to be changed. If the system must be drained, consult a trained and qualified Volvo service technician. See page 341 for inf ...

Low battery voltage
If the battery voltage is too low, the parking brake cannot be applied or released. Connect an auxiliary battery if the battery voltage is too low, see page 114. ...