Kia Optima: Fuel Filler Cap. Description and OperationDescription
A ratchet tightening device on the threaded fuel filler cap reduces the chances of incorrect installation, which seals the fuel filler. After the gasket on the fuel filler cap and the filler neck flange contact each other, the ratchet produces a loud clicking noise indicating the seal has been set.

InstallationTheft-alarm stage
The alarm will be activated if any of the following occurs while the system is
armed.
A front or rear door is opened without using the transmitter (or smart
key).
The tailgate is opened wit ...
Replacement
1.
Turn ignition switch OFF.
2.
Disconnect the negative (-) battery
cable.
3.
Disconnect the TCM connector
(A).
4.
Re ...
Vehicle Certification Label (MVSS Label)
The VIN also appears on the vehicle’s certification label and VIN label on the
pillar.
Chassis Number
Vehicle Emission Control Information/Vacuum Hose Routing Diagram
Tire Information Lab ...