Has the exhaust been checked for restrictions, is the EGR valve closing as it should.
Has the turbo been checked for play / clearance?
Has the supply for the control valve been load tested, is the PWM signal being pulled to earth ?
What pressure do you have on the supply side of the control valve, how much of it is getting though the valve with a high duty cycle applied?
Modern cars, Its all wizardry and witchcraft
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