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The oxygen sensors are used in automobiles in two main applications. The first oxygen sensor is installed on the exhaust piper right after the engine (before the catalytic converter) for providing feedback info to ECU to control the air/fuel ratio. The second sensor is installed on the exhaust piper after the catalytic converter to monitor the performance of the catalyst itself. The catalyst is also called three-way catalyst since it can convert three main toxic gases (Carbon monoxide, oxides of nitrogen, and hydrocarbons) to considerably less harmful and non-poisonous gases (carbon dioxide, water and nitrogen). Thus, the oxygen sensor is a key component to save the fuel and reduce emission for automobiles.

 

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