Catalytic Converters - Volvo V70 Owner's Manual

tion, see Key positions (p. 69) for more
information.
2. Press the START button without
depressing the brake and/or clutch pedal.
3. Wait approx. 1 minute.
4. To start the engine: Depress the brake
and/or clutch pedal and then press the
START button again.
NOTE
Before filling with fuel in the event of fuel
shortage:
•
Stop the car on as flat/level ground as
possible - if the car is tilting there is a
risk of air pockets in the fuel supply.
Draining condensation from the fuel
filter
The fuel filter separates condensation from
the fuel. Condensation can disrupt engine
operation.
The fuel filter must be drained at the intervals
specified in the Service and Warranty Booklet
or if you suspect that the car has been filled
with contaminated fuel. For more information,
see Volvo service programme (p. 325).
IMPORTANT
Certain special additives remove the water
separation in the fuel filter.
Related information
•
Fuel - handling (p. 289)
•
Diesel particle filter (DPF) (p. 293)
•
Fuel consumption and CO2 emissions (p.
391)
08 Starting and driving

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
themselves.
Lambda-sond TM oxygen sensor
The Lambda-sond is part of a control system
intended to reduce emissions and improve
fuel economy (see Fuel consumption and
CO2 emissions (p. 391)).
An oxygen sensor monitors the oxygen con-
tent of the exhaust gases leaving the engine.
This value is fed into an electronic system
that continuously controls the injectors. The
ratio of fuel to air directed to the engine is
continuously adjusted. These adjustments
create optimal conditions for efficient com-
bustion, and together with the three-way cat-
alytic converter reduce harmful emissions
(hydrocarbons, carbon monoxide and nitrous
oxides).
08
291