The immobilizer system protects your vehicle from theft. If an improperly coded key (or other device) is used, the engine’s fuel system is disabled.
When the ignition switch is placed in the ON position, the immobilizer system indicator should come on briefly, then go off. If the indicator starts to blink, the system does not recognize the coding of the key.
Place the ignition switch to the LOCK/OFF position, then place the ignition switch to the ON position again.
The system may not recognize your key’s coding if another immobilizer key or other metal object (i.e., key chain) is near the key. The engine may not start because the metal may interrupt the transponder signal from transmitting normally.
If the system repeatedly does not recognize the coding of the key, it is recommended that you contact your HYUNDAI dealer.
Do not attempt to alter this system or add other devices to it. Electrical problems could result that may make your vehicle inoperable.
WARNING
In order to prevent theft of your vehicle, do not leave spare keys anywhere in your vehicle. Your immobilizer password is a customer unique password and should be kept confidential.
NOTICE
The transponder in your key is an important part of the immobilizer system. It is designed to give years of trouble-free service, however you should avoid exposure to moisture, static electricity and rough handling. Immobilizer system malfunction could occur.
Hyundai Kona (OS) 2018-2025 Service Manual: Input shaft speed sensor 1 Repair procedures
Removal
1.
Remove the cleaner assembly and air duct.
(Refer to Engine Mechainical System - "Air Cleaner")
2.
Remove the battery and battery tray.
(Refer to Engine Electrical System - "Battery")
...
Hyundai Kona (OS) 2018-2025 Service Manual: Repair procedures
Teaching Procedures
1.
Key Teaching Procedure
Key teaching must be done after replacing a defective PCM(ECM) or
when providing additional keys to the vehicle owner.
The procedure starts with an PCM(ECM) request for vehicle ...