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Automotive oxygen sensors or lambda sensor is known as O2 sensors.

Modern electronic fuel injection and emission control is possible because of O2 sensor. O2 sensor helps to determine if the air fuel ratio of a car engine is rich or lean. O2 sensor is located in the exhaust system near catalytic convertor.

O2 sensor senses the concentration of oxygen in the exhaust gases and sends the signal to engine management system or ECU. Information from O2 sensor is coupled with information from other sensor of system is used to determine the air fuel ratio. So by using optimum air fuel ratio engine can burn fuel effectively and efficiently so emission is reduced.

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