Component Description

The heated oxygen sensor 1 is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1 to 0V.

Fig 1: Heated Oxygen Sensor HO2S1 Description (1 Of 2)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Heated Oxygen Sensor HO2S1 Description (2 Of 2)

Courtesy of NISSAN MOTOR CO., U.S.A.