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1977 Volvo 242 244 245
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pg. 51 Emission control systems
Oxygen sensor system
This is a self-tuning engine control system designed to reduce emissions and improve fuel economy.
An oxygen sensor monitors the composition of the exhaust gases leaving the engine. The exhaust gas
analysis is fed into an electronic unit which continuously influences a frequency valve. This adjusts the
air-fuel ratio to provide optimum conditions for combustion and efficient destruction of the three major
pollutants (hydrocarbons, carbon monoxide and nitrous gases) by a 3-way catalytic converter.
Change oxygen sensor unit and Inspect electrical connections of oxygen sensor system
The oxygen sensor must be replaced every 15,000 miles.
At the same time the electrical connections of the oxygen sensor system should be inspected for chafing
and corrosion.
Replace as necessary.
Special instructions for work on the fuel injection system
Extreme cleanliness is essential when working on the injection system. Great care must be observed.
Injection system service should be handled by qualified technicians, using equipment intended for this
service.
Fuel (line) filter
The fuel filter is located on the firewall. This filter is to be changed every 30,000 miles. The filter is
replaced as one complete unit.
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Filter replacement should be made in a shop.
Fuel (tank) filter
A filter is installed in the suction line in the fuel tank. Its function is to prevent any dirt in the tank from
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