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:
Volvo XC90 Owners Manual
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Symbols in the main instrument panel
Warning symbols
Indicator symbols
Other information symbols
Information symbols in the center console display
Information symbols in the ceiling console
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