Hyundai Accent: Heated Oxygen Sensor (HO2S). Description and Operation
Description
Heated Oxygen Sensor (HO2S) consists of zirconium and alumina
and is installed both upstream and downstream of the Manifold Catalytic Converter.
The sensor output voltage varies in accordance with the air/fuel ratio.
The sensor must be hot in order to operate normally. To keep
it hot, the sensor has a heater which is controlled by the ECM via a duty cycle
signal. When the exhaust gas temperature is lower than the specified value,
the heater warms the sensor tip.

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Install the component with the specified
torques.
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Specification
HO2S [Bank 1/Sensor 1]
Item
Specification
Heater Resistance (Ω)
2.4 ~ 4.0 [20°C(68°F)]
HO2S [Bank 1/Sensor 2 ...
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Installation
1.
Connect the horn connector, then reassemble the horn.
...