Heated oxygen sensors

The heated oxygen sensors monitor the oxygen content of the exhaust gases. Readings are fed into a control module that continuously monitors engine functions and controls fuel injection. The ratio of fuel to air into the engine is continuously adjusted for efficient combustion to help reduce harmful emissions.
See also:
Getting started
Use the controls on the steering wheel keypad
and in the center console to access, navigate
and make selections in the hands-free system’s
menus. ...
Before a long distance trip
It is always worthwhile to have your vehicle
checked by a trained and qualified Volvo service
technician before driving long distances.
Your retailer will also be able to supply you with
bulbs, ...
Location
Location ...
