Hyundai Sonata LF 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 — 90Engine Electrical System — 58Emission Control System — 24Engine Control System/Fuel System — 114Drive Shaft and Axle — 15Suspension System — 35Steering — 19Restraints — 50Brake System — 54Body (Interior and Exterior) — 213Body Electrical System — 241Heating, Ventilation, and Air Conditioning — 56DCT (Dual Clutch Transmission) System — 52
~1min read

Description

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

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