Greetings, kind Mercedes owners around the globe.

I have this issue with my 2010 w212 E250 cdi, I changed the injectors and reservoir pump and now it throws a check engine light, RPM won't pass 3000 and the OBD2 throws a P0086 (I think) code saying Suction Control valve stuck.

I looked all over the internet about it and it's obscure as hell... Anyone knows where thechell it is in the engine?

The engine is a OM651 if that helps.

Thank you