MHK100940A - Oxygen Sensor – Front

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Oxygen Sensor - Front is the upstream (pre-catalyst) lambda sensor in the exhaust system of the petrol engine. Threaded into the exhaust downpipe ahead of the catalytic converter, it measures the oxygen content of the exhaust gas and reports it to the engine management ECU. The ECU uses this signal to trim fuelling in closed-loop operation, holding the air/fuel mixture at the stoichiometric ratio for efficient combustion and correct catalyst operation. Show more