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    what does the oxygen sensor do in the exhaust system?

    +1  Views: 307 Answers: 1 Posted: 8 years ago

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    The goal of the sensor is to help the engine run as efficiently as possible and also to produce as few emissions as possible, it samples  the air fuel ratio. If there is less air than this perfect ratio, then there will be fuel left over after combustion. This is called a rich mixture. Rich mixtures are bad because the unburned fuel creates pollution. If there is more air than this perfect ratio, then there is excess oxygen. This is called a lean mixture. A lean mixture tends to produce more nitrogen-oxide pollutants, and, in some cases, it can cause poor performance and even engine damage. 



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