Kia Optima: Heated Oxygen Sensor (HO2S). Description and OperationThe 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.

Installation
Heated Oxygen Sensor (HO2S). SpecificationsSmart key
With a smart key, you can lock or unlock a door and even start the engine without
inserting the key.
The functions of the buttons on a smart key are similar to the remote keyless
entry. (Refer ...
Checking the Coolant Level
WARNING - Removing Radiator Cap
Never attempt to remove the radiator cap while the engine is operating.
Doing so might lead to cooling system and engine damage and could result in
serio ...
Front Door. Components and Components Location
Components
1. Front door trim
2. Front door quadrant inner cover
3. Front door belt inside weatherstrip
4. Front door module
5. Front door panel
6. Front door side impac ...