I love our A4 but i'm losing my hair FAST since we bought it! It WILL NOT come on boost! We bought the car from an auction and so were unaware of the problem beforehand. The most i've seen on the gauge is 1 PSI! I can get that to go to around 3 PSI by bypassing the N75 and disconecting the actuator ... I've done all the leak tests, changed the coolant sensor, tried a new MAF on it and had the Snap-on scanner from work plugged into it but nothing obvious came up. Anyone got any ideas? I'm taking it tomorrow to have it plugged into a Delphi scanner which is supposed to be the best on the market at the moment so we'll see what that says. I think i'm gonna buy an ebay lead and download a copy of VAGCOM so at least i don't have to rely on anyone else to diagnose it. Which lead do i need? Are they all the same? Cheers,Dean.