Hyundai i20 Quiz
Engine/Fuel Control System

Heated Oxygen Sensor (HO2S) Description and Operation

In this manual: Engine/Fuel Control System
General Information — 17Engine Mechanical System — 79Engine Electrical System — 50Emission Control System — 22Engine/Fuel Control System — 107Clutch System — 27MANUAL TRANSMISSION SYSTEM — 21Drive Shaft and Axle — 18Suspension System — 29Steering System — 21Restraint — 41Braking System — 53Body Work (Interior and Exterior) — 190Body Electrical System — 181Heating, Ventilation and Air Conditioning — 58
~1min read

Description

The Heated Oxygen Sensor (HO2S) consists of zirconia and alumina and is installed upstream and downstream of the manifold catalytic converter. The output voltage of the sensor depends on the air-fuel ratio. The sensor must be heated to function properly. To maintain heating, the element is equipped with a heater controlled by the ECM through a duty cycle signal. When the exhaust gas temperature is below the specified value, the heater warms the sensor tip.

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