The battery sensor is deactivated, when the battery is disconnected from the negative pole for maintenance purpose.
In this case, the ISG system is limitedly operated due to the battery sensor deactivation. Thus, the driver needs to take the following procedures to reactivate the battery sensor after disconnecting the battery.
Hyundai Kona (OS) 2018-2025 Service Manual: Heated Oxygen Sensor (HO2S) Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the HO2S connector.
3.
Measure resistance between the HO2S terminals 2 and 5 [B1/S1].
4.
Measure resistance between the HO2 ...
Hyundai Kona (OS) 2018-2025 Service Manual: Components and components location
Component Location
1. Sunroof
2. Sunroof motor & controller
3. Sunroof switch
...