Volvo XC90: Starting and driving / Emission controls
Three-way catalytic converter
- Keep your engine properly tuned. Certain engine malfunctions, particularly
involving the electrical, fuel or distributor ignition systems, may cause unusually
high threeway catalytic converter temperatures. Do not continue to operate your
vehicle if you detect engine misfire, noticeable loss of power or other unusual
operating conditions, such as engine overheating or backfiring. A properly tuned
engine will help avoid malfunctions that could damage the three-way catalytic
converter.
- Do not park your vehicle over combustible 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 catalytic converter or exhaust
system overheating.
- Remember that tampering or unauthorized 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 repeated use of leaded fuel.
NOTE
Unleaded fuel is required for vehicles with three-way catalytic converters.
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.
Volvo requires premium fuel (91 octane1 or higher) for all T5, T6
and T8 engines, and recommends AKI 93 for optimal performance and fuel economy.
See decal examples in illustrations 1 and 2...
In certain driving conditions, such as driving in mountainous areas or hot
weather, there is a risk of the engine or transmission overheating, especially when
carrying heavy loads...
Other information:
(Option/accessory.)
There is a function button for assistance on steep gradients with Hill
Descent Control in the center display's Function view if the vehicle is not
equipped with a drive mode control in the tunnel console.
Selecting Hill Descent Control in the center display's Function view
HDC only works at low speeds...
In certain situations, it may be advisable to turn the Start/Stop function
off.
To turn off Start/Stop, tap the
Start/Stop function button in the center display's Function view. The indicator
light in the button will go out when the function has been turned off...