
This warning light illuminates:
NOTICE
- Malfunction Indicator Lamp (MIL)
Driving with the Malfunction Indicator Lamp (MIL) on may cause damage to the emission control systems which could affect drivability and/or fuel economy.
NOTICE
If the Malfunction Indicator Lamp (MIL) illuminates, potential catalytic converter damage is possible which could result in loss of engine power.
In this case, have your vehicle inspected by an authorized HYUNDAI dealer.
Electric Power Steering (EPS) Warning Light
Charging System Warning LightHyundai Sonata LF 2014-2019 Service Manual: Start/Stop Button Repair procedures
   Removal
1.
Disconnect the negative(-) battery terminal.
2.
Remove the center facia panel.
(Refer to Heating, Ventilation and Air Conditioning - "Controller")
3.
Remove the start/stop button (A) after loosening the screw (3EA).
Installation 
1.
Install the start/stop button.
2.
 ...
   
Hyundai Sonata LF 2014-2019 Service Manual: Injector Description and Operation
   Description
The GDI injector is similar to a standard injector, but 
sprays fuel at a much higher pressure directly into the combustion 
chamber and has a swirl disc to get the fuel swirling as it exits the 
nozzle. This aids in atomization of the fuel.
The ECM controls both the feed circuits ...