The (O2) Oxygen Sensors are often referred to as the “O2” sensor because O2 is the chemical formula for oxygen.
So, Monitoring (O2) Sensor levels in the exhaust is a way of gauging the fuel mixture.
When oxygen sensors don’t provide accurate data then a lot of problems will occur like drivability, an increase in fuel usage, and failure of emission.
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The sensor is part of the emissions control system and provides data to the engine management computer. The exhaust (O2) sensors are used in determining if the air-fuel mixture is rich or lean. Modern spark-ignited combustion engines employ (O2) sensors and catalytic converters to ensure that engines burn their fuel efficiently and cleanly in order to reduce exhaust emissions.
Thus, these sensors also help in reducing the amounts of both unburnt fuel and oxides of nitrogen entering the atmosphere. Since oxygen sensors are located in the exhaust stream, they do not measure the amount of air or the fuel entering the engine directly. However, when information from oxygen sensors is combined with information from other sources, it can be used to indirectly determine the air-fuel ratio.
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