Hyundai Elantra HD: Heated Oxygen Sensor (HO2S). Description and Operation
Function And Operation Principle
Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed
on upstream and downstream of the Manifold Catalyst Converter (MCC). After it
compares oxygen consistency of the atmosphere with the exhaust gas, it transfers
the oxygen consistency of the exhaust gas to the ECM. In order that this sensor
normally operates, the temperature of the sensor tip is higher than 370°C (698°F).
So it has a heater which is controlled by the ECM duty signal. When the exhaust
gas temperature is lower than the specified value, the heater warms the sensor
tip.
