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1993 Volvo 940
pg. 8:9 Servicing (cont.)
Three-way 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. Vehicles
equipped with heated oxygen sensors use three-way catalytic converters containing platinum and
rhodium.
CAUTION:
Vehicles with a three-way catalytic converter must use unleaded fuel only. Otherwise the three-way
catalytic converter will become ineffective. See "Fuel requirements".
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