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1993 Volvo 240
Heated Oxygen Sensor
On the B230F engines, the oxygen sensor is electrically heated. The use of a PTC (Positive Temperature
Coefficient) element to heat the oxygen sensor ensures a shorter warm up time and continuous operation
at its working temperature.
The heated oxygen sensor does not require periodic replacement.
Three Way Catalytic Converter
This is a supplementary device in the exhaust system, designed to reduce exhaust emissions.
This device is mainly a container with a ceramic material insert, designed to let exhaust gases pass
through channels in the insert. The channel walls are covered by a thin layer of platinum and rhodium.
These metals act as catalysts, permitting a chemical action to occur without actually taking part in it.
The carbon monoxide content will increase i the Three Way Catalytic Converter is damaged.
CAUTION:
Vehicles with Three Way Catalytic Converter must use unleaded fuel only. Otherwise the Three Way
Catalytic Converter will become damaged and ineffective.
pg. 80 Servicing (cont.)
Engine Crankcase Ventilation system
Crankcase ventilation
The engine is provided with positive crankcase ventilation (PCV) which prevents crankcase gases from
being released into the atmosphere.
Instead, the crankcase gases are admitted to the intake manifold and cylinders.
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