Hyundai Genesis DH Quiz
Engine Control System/Fuel System

Heated Oxygen Sensor (HO2S) Description and Operation

In this manual: Engine Control System/Fuel System
General Information — 9Engine Mechanical System — 103Engine Electrical System — 54Emission Control System — 23Engine Control System/Fuel System — 127Automatic Transmission System (SBC) — 90All-Wheel Drive (AWD) System — 20Drive Shaft and Axle — 27Suspension System — 41Steering — 19Restraints — 56Brake System — 56Body (Interior and Exterior) — 211Body Electrical System — 279Heating, Ventilation, and Air Conditioning — 55
~1min read

Description

The Heated Oxygen Sensor (HO2S) consists of zirconia and alumina and is installed at the inlet and outlet of the catalytic converter (MCC). 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 air-fuel 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 controlled by the ECM duty signal. When the exhaust gas temperature is below a specified value, the heater warms the sensor tip.

Test yourself

A quick Hyundai Genesis DH quiz: every answer comes with an explanation and a link to the manual page.