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.

InstallationRemote Trunk Lid Release
To open the trunk, pull the release switch toward you. ...
Repair procedures
Component Replacement After Deployment
Before doing any SRS repairs, use the GDS Pro to check for DTCs. Refer to
the Diagnostic Trou ...
Description
The immobilizer system will disable the vehicle unless the proper ignition key is
used. In addition to the currently available anti-theft systems such as car alarms,
the immobilizer system aims to ...