Kia Optima Hybrid: Engine Control System / Heated Oxygen Sensor (HO2S) Repair procedures

Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the HO2S connector.
3.
Measure resistance between the HO2S terminals 4 and 5 [B1/S1].
Measure resistance between the HO2S terminals 3 and 4 [B1/S2].
4.
Check that the resistance is within the specification.
HO2S [Bank 1/Sensor 1] (Linear type)
Item
Specification
Heater Resistance (?)
2.5 ~ 4.0 [20°C(68°F)]

HO2S [Bank 1/Sensor 2] (Binary type)
A/F Ratio (?)
Output Voltage(V)
RICH
Approx. 0.92
LEAN
Approx. 0.04

Item
Specification
Heater Resistance (?)
3.3 ~ 4.1?[21°C(69.8°F)]

Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Disconnect the connector (A), and then remove the sensor (B).
   
Note that the SST (Part No.: 09392-2H100) is useful when removing the heated oxygen sensor.
[Bank 1 / Sensor 1]

[Bank 1 / Sensor 2]

Installation
   
Install the component with the specified torques.
Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.
   
Do not use a cleaner, spray, or grease to sensing element and connector of the sensor because oil component in them may malfunction the sensor performance.
Sensor and its wiring may be damaged in case of contacting with the exhaust system (Exhaust Manifold, Catalytic Converter, and so on).
1.
Install in the reverse order of removal.

Heated oxygen sensor installation :
39.2 ~ 49.1 N.m (4.0 ~ 5.0 kgf.m, 28.9 ~ 36.2 lb-ft)

Heated Oxygen Sensor (HO2S) Schematic Diagrams

Circuit Diagram ...

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