Volvo 2015 S60 Owner's Manual page 298

07 During your trip
Refueling
help avoid malfunctions that could dam-
age the three-way catalytic converter.
•
Do not park your vehicle over combusti-
ble materials, such as grass or leaves,
which can come into contact with the hot
exhaust system and cause such materials
to ignite under certain wind and weather
conditions.
•
Excessive starter cranking (in excess of
one minute), or an intermittently firing or
flooded engine can cause three-way cat-
alytic converter or exhaust system over-
heating.
•
Remember that tampering or unauthor-
ized modifications to the engine, the
Engine Control Module, or the vehicle
may be illegal and can cause three-way
catalytic converter or exhaust system
overheating. This includes: altering fuel
injection settings or components, altering
emission system components or location
or removing components, and/or repea-
ted use of leaded fuel.
07 NOTE
Unleaded fuel is required for vehicles with
three-way catalytic converters.
Heated oxygen sensors
The heated oxygen sensors monitor the oxy-
gen content of the exhaust gases. Readings
296
are fed into a control module that continu-
ously 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 emis-
sions.