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An Oxygen Sensor is an automotive component used in the engine management system of vehicles, primarily to measure the concentration of oxygen in the exhaust gases emitted by the internal combustion engine. Its primary function is to optimize the air-fuel mixture ratio, thereby enhancing engine performance and reducing harmful emissions. The sensor works by generating a voltage signal proportional to the amount of oxygen present in the exhaust gas stream. This information is then fed back to the engine control unit (ECU), which adjusts the fuel injection rate accordingly. By continuously monitoring the oxygen content, the ECU can maintain an optimal air-fuel mixture across various driving conditions, improving both fuel efficiency and emissions performance. Oxygen sensors are typically installed in the exhaust manifold or close to the catalytic converter. They may be found in different configurations, including heated and unheated types, depending on the specific application requirements of the vehicle. Regular maintenance and replacement of these sensors is crucial for ensuring optimal engine performance and compliance with emissions standards.