Kia Cadenza VG Owner's Manual Quiz
Engine Control System/Fuel System

Heated Oxygen Sensor (HO2S) Description and Operation

In this manual: Engine Control System/Fuel System
General Information — 15Engine Mechanical System — 95Engine Electrical System — 54Emission Control System — 24Engine Control System/Fuel System — 115Automatic Transmission — 91Drive Shaft and Axle — 13Suspension System — 35Steering — 19Restraints — 46Brake System — 43Body (Interior and Exterior) — 51Body Electrical System — 245Heating, Ventilation, and Air Conditioning — 56
~1min read

Description

The heated oxygen sensor (HO2S) consists of zirconia and alumina and is installed at the inlet and outlet of the warm-up three way catalytic converter (WCC). It compares the oxygen concentration of the atmosphere with that of the exhaust gas and transmits the exhaust gas oxygen concentration to the ECM. When the A/F ratio is rich or lean, it generates approximately 1 V or 0 V, respectively. For this sensor to operate properly, the sensor tip temperature must be above 370 °C. Therefore, it has a heater which is controlled by the ECM duty signal. When the exhaust gas temperature is below the specified value, the heater warms the sensor tip.

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