First thing to check would be all the high pressure hoses leading from the turbo... There were a number of cases where there was a leak/split in the rubber hose, opening up under pressure...Hey all , first of all i would like to thank the lot of you. This forum is by far the most helpfull alfa database. congrats!
Here i go .. i recently bought a 156 JTDm 16v and the Motor control system failure came up , took it to the the local afla dealer and they put it on the examinar in front of me , and the turbo pressure was wayyy low around 900 . turned off the error code and on hard acceleration the MCSF turned on again.
i drove the car for about 2weeks really slowly and the MCSF turned of by itsself "sweet" so i put the pedal into the ground and sure enouf the MCSF cam back , btw the car cant go over 120KM even if you drop to 3rd gear "six speed gearbox btw"
all thoughts are welcome