i own a 1998 v6 tdi auto recently has started having problems with the turbo it was a intermittant fault one day it would boost and one day it wouldnt boost eventually after a couple of weeks it stopped working completly i had a falut reading of 00575 low or no inlet manifold pressure i found the fault to be the wastegate was stuck shut i took the turbo off and had it looked at and sorted out i refitted it and things were back as normal again after a couple of days we started having problems again with the boost the turbo is spinning and i am getting some boost but not as it should be . on this vnt model of turbo on tick over the wastegate is open if you pull the pipe off the actuator the wastegate closes everything seems very linnier and functioning correctly so i dont think that the turbo is at fault again. my gut feeling is that i think the n75 boost controller also has an intermittant problem but my experience with this engine is limited if anybody has idea what the problem may be i would be grateful if you write back to me, thanks for reading arron