When the interior light switch is in the DOOR position and all doors (and tailgate) are locked and closed, the room lamp will come on for 30 seconds if any of the below is performed.
At this time, if you press the door lock or unlock button, the room lamp will turn off immediately.
Kia Niro 2017 (DE HEV) Service Manual: Electric EGR Control Valve Description and operation
Description
The Electric EGR Control Valve is a solenoid valve installed between the EGR
cooler and the exhaust line that controls the EGR (Exhaust Gas Recirculation) amount
by the ECM's duty control signal depending on engine load and the intake air demand.
The Exhaust Gas R ...
Kia Niro 2017 (DE HEV) Service Manual: Exhaust System Repair procedures
Inspection
1.
Visually check the pipes, hangers and connections for severe corrosion,
leaks or damage.
2.
Check for unusual exhaust sounds or abnormal exhaust fumes.
...