Kia Rio: Engine Control System / Heated Oxygen Sensor (HO2S)

Specifications

Heated Oxygen Sensor (HO2S)

HO2S [Bank 1/Sensor 1]

HO2S [Bank 1/Sensor 2]

Description and operation

Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed on upstream and downstream of the Warm up Catalytic Converter (WCC).

After it compares oxygen consistency of the atmosphere with the exhaust gas, it transfers the corresponding voltage signal to the ECM. When A/F ratio is rich or lean, it generates approximately +1V or 0V respectively.

In order that this sensor normally operates, the temperature of the sensor tip must be higher than predetermined temperature. So it has a heater which is controlled by the ECM duty signal. When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.

Schematic diagrams

Repair procedures

Note that the SST (Part No.: 09392-2H100 or 09392-1Y100) is useful when removing the heated oxygen sensor.

• Install the component with the specified torques. • Note that internal damage may occur when the component is dropped. In this case, use it after inspecting. • DON’T use a cleaner, spray, or grease to sensing element and connector of the sensor because oil component in them may malfunction the sensor performance. • Sensor and its wiring may be damaged in case of contacting with the exhaust system (Exhaust Manifold, Catalytic Converter, and so on).

Troubleshooting