Hi all I'm looking for some help with my Fiesta 180ST MP215 Mountune and a friend suggested I get on here as someone may know.
I'm having an issue with my ST at high revs, in that it drops into limp mod and the maintenance info comes up on the screen.
When I clear this and turn the car off and on again it works fine, I notice it more if I have my foot to the floor and change up quickly and apply more right foot.
I have been looking online and think it could be either the Diverter value or Boost Control Solenoid, neither part is extremely expensive in the grand scheme of things but wanted some advice as to whether I'm in the right ball park with the diagnosis.

Other than the Mountune upgrade the car is standard and runs fine as long as I'm not pushing the revs to the point of over boost, any help on this would be great