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STARTING AND DRIVING
* Option/accessory, for more information, see Introduction.
318
The car always starts with petrol even if gas oper-
ation is selected. When the engine has started
the system automatically changes to gas opera-
tion - normally within a few seconds of a warm
start.
When starting with a cold engine it will take
longer before the car changes to gas operation in
order to ensure the lowest possible emissions.
warning lamp
If the warning lamp in the switch illuminates,
and/or repetitive acoustic signals can be heard,
then the car needs servicing. Acknowledge the
warning by pressing the switch and visit the near-
est workshop - an authorised Volvo workshop is
recommended.
Related information
•
Bi-Fuel* - introduction to vehicle gas (p. 25)
•
Filling vehicle gas* (p. 317)
•
Inspection and service of the system for vehi-
cle gas* (p. 368)
•
Fuel filler flap - manual opening (p. 312)
Catalytic converters
The purpose of the catalytic converters is to
purify exhaust gases. They are located close to
the engine so that operating temperature is
reached quickly.
The catalytic converters consist of a monolith
(ceramic or metal) with channels. The channel
walls are lined with a thin layer of platinum/
rhodium/palladium. These metals act as cata-
lysts, i.e. they participate in and accelerate a
chemical reaction without being used up them-
selves.
Lambda-sond
TM
oxygen sensor
The Lambda-sond is part of a control system
intended to reduce emissions and improve fuel
economy. For more information, see Fuel con-
sumption and CO2 emissions (p. 439).
An oxygen sensor monitors the oxygen content
of the exhaust gases leaving the engine. This
value is fed into an electronic system that contin-
uously controls the injectors. The ratio of fuel to
air directed to the engine is continuously
adjusted. These adjustments create optimal con-
ditions for efficient combustion, and together with
the three-way catalytic converter reduce harmful
emissions (hydrocarbons, carbon monoxide and
nitrous oxides).
Related information
•
Fuel - petrol (p. 314)
•
Fuel - diesel (p. 314)
Economical driving
Drive economically and eco-consciously by driv-
ing smoothly, thinking ahead, and adjusting your
driving style and speed to the prevailing condi-
tions.
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