Kia Optima: Engine Control System / Heated Oxygen Sensor (HO2S)
Description and operation
• |
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.
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• |
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.
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[Front Heated Oxygen
Sensor]

[Rear Heated Oxygen
Sensor]

Components and components location

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

Harness Connector
[Front Heated Oxygen Sensor]

[Rear Heated Oxygen Sensor]

Repair procedures
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
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(3) |
Forced operation : Checks the system operating status
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(4) |
Additional function : Controls system options, zero point adjustment
and other functions
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|
1. |
Check signal waveform of HO2S using a KDS.
Specification : Refer to "DTC diagnostic guide"
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|
[Front Heated Oxygen Sensor] |
1. |
Disconnect the negative battery terminal.
|
2. |
Disconnect the connector (A).

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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)
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• |
Install the components to the specified torque.
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• |
Note that internal damage may occur when the component is dropped.
In this case, use it after inspecting.
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• |
Do not use a cleaner, spray or grease on the sensing element
and connector because they could cause a malfunction of sensor.
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• |
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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Specifications
Specification
Item
Specification
Capacitance (pF)
850 - 1,150
Description and operation
Descrip ...
Specifications
Specification
Accelerator
Output Voltage (V) [Vref = 5.0V]
Position
APS1
APS2
C.T
...
Other information:
On a vehicle equipped with a smart key, the trunk lock is released with no-touch
activation using the Smart Trunk system.
How to use the Smart Trunk
The trunk can be opened with notouch activation if the following conditions are
met:
It has been over 15 seconds since all doors closed and ...
To raise the headrest, pull it up to the desired position (1). To lower the headrest,
push and hold the release button (2) on the headrest support and lower the headrest
to the desired position (3).
✽ NOTICE
If you recline the seatback towards the front with the headrest and seat cushion ...