The Oxygen Sensor (SO2 1) is located in the exhaust manifold, the function of this sensor is to detect the amount of oxygen in the exhaust gas compared to the outside air. SO2 1 has a tube in the extreme part which is closed, made of ceramic zirconium, material that generates voltage according to the conditions, for example, at 1V in rich conditions and at 0V in milder conditions.
This sensor sends a signal to the ECM computer, (Engine Control module), which adjusts the duration of the injection propulsion, thus achieving an ideal air-fuel ratio. This relationship is produced close to the radical change from 1V to 0V.