I have had five vehicles with this problem in the last year or so and didn't check the boost pressure on any of them. Others may go this route but the cause has always been found quicker than the time it takes to set up pressure gauges etc. If the DTC is telling you that you have overboost then you probably have. As Darren has said, this should have perhaps been done at the point you replaced the MAP (or boost pressure sensor, whatever you want to call it). I will tell you that one the five had a leak at the vacuum pipe to the turbo control diaphragm, two had vacuum leaks on solenoid valves (not necessarily the turbo control valve), one of which the main dealer said needed a new turbo, and two of these had siezed turbo control, whether thats a wastegate or variable vane is not relevant. For further info the vehicles with siezed turbo control have usually just been purchased and driven harder than the previous pensioner that owned it!
HTH's
Bryan.
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