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Here’s a clear description you can use for an Oxygen Sensor:
Oxygen Sensor (O2 Sensor)
An oxygen sensor is a key component in a vehicle’s exhaust system. It monitors the amount of oxygen in the exhaust gases and sends this information to the engine control unit (ECU). The ECU then adjusts the air-fuel mixture for better combustion, improved fuel efficiency, and reduced harmful emissions.
If the oxygen sensor fails, it can cause poor fuel economy, rough engine performance, and higher emissions.
Functions:
Measures oxygen levels in exhaust gases
Helps maintain the right air-fuel ratio
Improves fuel efficiency
Reduces engine emissions