Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
As I noticed that GDI engine on Sonata 2016 has GDI injector. Following the system how it works and how to diagnose the waveform, I came across that fuel rail pressure is nearly 199 Bar.
The question is " how come that pressure is made? does the fuel pump generates such pressure or there might be a booster that I dont know about it.
