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 up if the computer senses a condition that potentially may need correcting. When this happens, please have your vehicle checked by a trained and qualified Volvo service technician as soon as possible.
A CHECK ENGINE light may have many causes.
Sometimes, you may not notice a change in your vehicle's behavior. Even so, an uncorrected condition could hurt fuel economy, emission cleanliness, and driveability.
Extended driving without correcting the cause could even damage other components in your vehicle.
Canadian models are equipped
with this warning light.
See also:
The Federal Clean Air Act – U.S.
The Federal Clean Air Act requires vehicle
manufacturers to furnish written instructions to
the ultimate purchaser to assure the proper
servicing and function of the components that
control emissi ...
Changing
WARNING
Connect and disconnect the positive and negative cables in the correct sequence.
Removal
Switch off the ignition, remove the remote key from the ignition slot and wait
at least 5 ...
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. ...
