Volvo XC90 Owner's Manual page 254

06 During your trip
Refueling
Heated oxygen sensors
The heated oxygen sensors monitor the oxy-
gen 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 combus-
tion to help reduce harmful emissions.
06
I n f o r m a t i o n P r o v i d e d b y :
254