2004 Ford C-Max turbo problems

I bought this car in september 2011 and have had lots of trouble with the turbo I have had 2 mechanical engineers out with hand held testers the first guy only got the 2 codes up for camshaft and crankshaft position sensors but did, nt take it for a test drive as the car would, nt start for 20 mins so I took it to my garage that I have been going to for a number of years and they tested it and all of the codes come up for camshaft, crankshaft, position sensor and turbo/super charger boost sensor A circuit high and high speed CAN communication bus -intermittent which I was sort of pleased because it was telling me that there WAS something wrong with the turbo now a couple of week later a 2nd mechanical engineer as come out and got all of the codes that my garage recieved on ther tester but this engineer took the car for a road test so I was wondering why he got all the codes that the 1st engineer did NOT recieve