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:
Driver distraction
A driver has a responsibility to do everything
possible to ensure his or her own safety and
the safety of passengers in the vehicle and others
sharing the roadway. Avoiding distractions
is par ...
Volvo XC90 Owners Manual
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