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The Oxygen Sensor in a Car

Model: BMW Serie 5 E39 - Years 1995-2003
Part: Engine

The oxygen sensor is a device that measures the air-fuel ratio in an internal combustion engine. It plays a crucial role in controlling exhaust emissions. The oxygen sensor ensures that a catalytic converter functions properly. The position of the oxygen sensor in a car is between the exhaust section upstream of the catalytic converter and measures the composition of the exhaust gas through the residual oxygen content. Based on this value, the engine control unit adjusts the mixture composition for the fuel injector system.

Updated on 9 February 2026 by ScegliAuto

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