griever

I have a BA that is putting up error code of too much boost. When you floor it when it gets to about 100kph, it loses power and then regains it. I put it on a dyno and the boost didn't go over 7lb. I am wondering if it is a sensor problem because the motor is sensing there is too much boost and then it shuts itself down to protect the motor. Can anyone help identify the problem, is it a sensor, the computer, or the actuator thing which opens the wastegate?