Hello, 

I have this problem that the glow plug warning light comes on and flashes. I am new to the Obdeleven game but I got this fault code:

- P1400 Egr vacuum regulator solenoid valve - error in circuit. 

So I replaced the N75 valve since I had one and it didnt work. 

I measured voltage in to it and got 12v and 3v out of the both contacts. 

Followed the wires into the ecu and replaced the ecu because I had a spare one. But no luck. 

Thats where I am now. 

Can anyone point me in some direction? And maybe how to troubleshoot with obdeleven?

The engine runs fine. No limpmode. 

Did you solve the problem? 
I have had this error come on occasionally but the main error for my Skoda is fuel regulator valve low circuit or short to ground. 
 

I have checked the grounding points I could see and all test fine (12.10v like the battery )