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

Kia Optima DL3 2019-2020 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / Heated Oxygen Sensor (HO2S)

Description and operation
Description

Heated Oxygen Sensor (HO2S), consisting of zirconium and alumina, is installed on both upstream and downstream of the Manifold Catalytic Converter (MCC) to detect the air/fuel ratio and send it to the ECM.

In order that this sensor operates properly, the temperature of the sensor tip must be higher than 370°C (698°F).

For this reason, a heater controlled by the ECM duty signal, is built into the sensor.

When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.

[Front Heated Oxygen Sensor]

[Rear Heated Oxygen Sensor]

Components and components location
Components Location

1. Front Heated Oxygen Sensor
2. Rear Heated Oxygen Sensor

Schematic diagrams
Circuit Diagram

Harness Connector

[Front Heated Oxygen Sensor]

[Rear Heated Oxygen Sensor]

Repair procedures
Inspection
1.

The engine control system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)

Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)

Sensor data : Checks the system input/output value status

(3)

Forced operation : Checks the system operating status

(4)

Additional function : Controls system options, zero point adjustment and other functions

Component Inspection
1.

Check signal waveform of HO2S using a KDS.

Specification : Refer to "DTC diagnostic guide"

Removal
[Front Heated Oxygen Sensor]
1.

Disconnect the negative battery terminal.

2.

Disconnect the connector (A).

3.

Remove the heated oxygen sensor (B) by using the SST (09392-1Y100)

Tightening torque:

39.2 - 49.1 N·m (4.0 - 5.0 kgf·m, 28.9 - 36.2 lb·ft)

[Rear Heated Oxygen Sensor]
1.

Disconnect the negative battery terminal.

2.

Disconnect the heated oxygen sensor connector (A).

3.

Remove the heated oxygen sensor (B) by using the SST (09392-1Y100)

Tightening torque:

39.2 - 49.1 N·m (4.0 - 5.0 kgf·m, 28.9 - 36.2 lb·ft)

Installation
  

Install the components to the specified torque.

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 on the sensing element and connector because they could cause a malfunction of sensor.

The sensor or the wiring can be damaged by being contacted to the exhaust system (Exhaust manifold, Catalytic converter etc.)

1.

Install in the reverse order of removal.

2.

Reset the ECM adaptive value after replacing the heated oxygen sensor.

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