Volvo 1991 740 Model
Lambda-sond (oxygen sensor)
system
This is an emission control system designed to reduce emissions and improve fuel economy. The heated
oxygen sensor monitors the composition of the exhaust gases leaving the engine. The exhaust gas
analysis is fed into an electronic control module. This adjusts the air-fuel ratio to provide optimum
conditions for combustion and efficient reduction of the three major pollutants (hydrocarbons, carbon
monoxide and nitrous gases) by a 3-way catalytic converter.
pg. 8:11 Servicing (cont.)
Catalytic Converter
This is a supplementary device in the exhaust system, designed to clean exhaust gases. This device is
mainly a container with a ceramic material insert, designed to let the exhaust gases pass through
channels in the insert. The channel walls are covered by a thin layer of platinum-palladium. These
metals act as catalysts, permitting a chemical action to occur without actually taking part in it.
The emission (CO, HC, NOx) content will increase if the three-way catalytic converter is damaged.
Lambda-sond equipped vehicles use Catalytic Converters containing platinum and rhodium.
CAUTION:
Vehicles with a Catalytic Converter must use unleaded fuel only. Otherwise the Catalytic Converter
will become ineffective. See "Fuel requirements".
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