The smart key may not work if any of the following occur:
If the smart key does not work correctly, open and close the door with the mechanical key. If you have a problem with the smart key, it is recommended that you contact an authorized HYUNDAI dealer.
If the smart key is in close proximity to your mobile phone, the signal could be blocked by your mobile phone’s normal operational signals. This is specifically relevant when the phone is active such as making and receiving calls, text messaging, and/or sending/receiving emails.
Avoid placing the smart key and your mobile phone in the same location and always try to maintain an adequate distance between the two devices.
Information
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. If the keyless entry system is inoperative due to changes or modifications not expressly approved by the party responsible for compliance, it will not be covered by your manufacturer’s vehicle warranty.
NOTICE
Keep the smart key away from electromagnetic materials that blocks electromagnetic waves to the key surface.
NOTICE
Always have the smart key with you when leaving the vehicle. If the smart key is left near the vehicle, the vehicle battery may be discharged.
Hyundai Kona (OS) 2018-2023 Owners Manual: Parking Distance Warning (Reverse) system precautions
The Parking Distance Warning (Reverse) system may not sound consistently
depending on the speed and shapes of the objects detected.
The Parking Distance Warning (Reverse) system may malfunction if the vehicle
bumper height or sensor installation has been modified or damaged. Any non-factory
...
Hyundai Kona (OS) 2018-2023 Service Manual: Repair procedures
Operation and Leakage Check
Check all of the following items :
Component
Procedure
Brake Booster (A)
Check brake operation by applying the brakes during a test drive. If the
brakes do not work properly, check the brake boo ...