As Lee says, road test while monitoring boost pressure sensor readings, if it suddenly jumps to an implausible value much higher than 2 seconds previously it will be the sensor.

The moment it looses power is the moment it is logging an overboost code, the ECU drops into limp home on these if it sees to much pressure.
If you can log it & compare the data between the boost pressure sensor & the moment the code logged you should see the cause of your fault.