Question about 1984 Volvo 240 Series
First used in February of 1977 on Volvo B21 four cylinder engines, the
Lambda-Sond system was an emissions reduction system which used three
key components working together:-
1) Lambda Sensor. An exhaust gas composition sensor to monitor chemical composition of engine exhaust gases; especially NOx (oxides of nitrogen) which feeds data to the engine control system. In simple terms it's an oxygen sensor positioned in the exhaust pipe before the catalytic converter.
2) A feedback loop providing information to the engine control computer that enabled more precise control of the fuel injection system.
3) A catalytic converter.
This system greatly reduced exhaust emissions while allowing much better performance and fuel economy. It proved to be a key to restoring the performance lost by the addition of emission controls on vehicles. It was the forerunner to modern electronic engine management systems that eventually appeared as similar systems on all road-going vehicles.
So it's a very, very, good thing and like all similar systems requires periodic maintenance and repair, usually the parts which fail are the lambda sensor and/or the catalytic converter.
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Posted on Oct 07, 2010
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Posted on Jan 02, 2017
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