Kia Cee'd Quiz
Fuel System

Heated Oxygen Sensor (HO2S) Description and Operation

In this manual: Fuel System
General Information — 15Maintenance — 7Engine Mechanical System — 84Engine Electrical System — 49Emission Control System — 22Fuel System — 95Clutch System — 28Manual Transmission — 21Dual Clutch Transmission (DCT) System — 47Drive Shaft and Axle — 20Suspension System — 36Steering — 23Restraints — 39Brake System — 54Body (Interior and Exterior) — 209Body Electrical System — 254Heating, Ventilation, and Air Conditioning — 56
~1min read

Description

The Heated Oxygen Sensor (HO2S) consists of zirconia and alumina and is installed both upstream and downstream of the manifold catalytic converter. The sensor output voltage changes according to the air-fuel ratio. For proper operation, the sensor must be hot. To keep it hot, the sensor has a heater, which is controlled by the ECM using a duty cycle signal. When the exhaust gas temperature is below a specified value, the heater warms the sensor tip.

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