Superb 1.6TDi error P0403 EGR Valve (N18)

Hi all, about a week ago the flashing Glow plug light appeared in my 2011 Superb 1.6 TDI after some city driving, and after some minutes followed by the check engine light and limp mode. The lights went off after switching off and on the car. Another day, still after some driving, both lights come on again, same story.. Basically i have noticed that the lights come on after some driving, and after the engine reach the temperature, in the MFA appears a message saying "Engine malfunctioning Workshop" or something like that, followed by "Start-Stop Error". So i made a scan with VCDS. And these are the results:

7462 - EGR VALVE (N18)

                   P0403 00 [104] - Malfunction

You can see the full code on the picture. Thanks in advance.