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:
Vehicle Overview
Long known for safe, solid sedans and wagons, Volvo joined the sport utility
vehicle fray in 2003 with its car-based XC90. The Swedish automaker promised the
ride and handling of a passenger car. ...
Brake system
The brake system is a hydraulic system consisting of two separate brake circuits.
If a problem should occur in one of these circuits, it is still possible to stop
the vehicle with the other brake ...
Convertible Negatives
With the top down, the C70 isn't as proficient as others in its class at
cutting down turbulence in the cabin; you'll feel more wind rushing through your
hair and "massaging" the side of ...
