A Lambda sensor measures oxygen content in the exhaust gas.
This information helps the ECU understand combustion and, on many petrol engines, control the airfuel mixture.
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Petrol engines
Lambda control can be closely related to:
fuel mixture,
closed-loop operation,
catalyst monitoring,
emission control.
Diesel engines
Modern diesel vehicles can also use Lambda/O2 sensors for different control and emission strategies.
Therefore, Lambda should not automatically be considered a petrol-only function.