
If the Smart Key is not working properly, try replacing the battery with a new one.
Battery Type: CR2032
To replace the battery:
1. Remove the mechanical key.
2. Use a slim tool to pry open the rear cover
of the smart key.
3. Remove the old battery and insert the new battery. Make sure
the battery position is correct.
4. Reinstall the rear cover of the smart key.
If you suspect your smart key might have sustained some damage, or you feel your smart key is not working correctly, it is recommended that you contact an authorized HYUNDAI dealer.
Information

An inappropriately disposed battery can be harmful to the environment and human health. Dispose of the battery according to your local law(s) or regulations.
Smart key precautions
Immobilizer systemHyundai Kona (OS) 2018-2026 Service Manual: CVVT (Continuous Variable Valve Timing) System Description and operation
Description
Continuous Variable Valve Timing (CVVT) system advances or retards the valve
timing of the intake and exhaust valves in accordance with the ECM control signal
calculated by the engine speed and load.
By controlling CVVT, the valve over-lap or under-lap occurs, w ...
Hyundai Kona (OS) 2018-2026 Service Manual: Starter Repair procedures
Removal
1.
Disconnect the battery negative terminal.
2.
Remove the under cover.
(Refer to Engine Mechanical System - "Engine Room Under Cover")
3.
Remove the vacuum pump.
(Refer to Bra ...