Thanks for everyones help on this problem. After changing the one of the two N75 valves, car still triping into limp home mode. Was going to get a second N75, but yesterday I found the problem! Look at the pics then read some more! There is 3 hose connections, one black and two white ones, the 2 white ones are vacuum and out, whilst the valve sucks air in from the black connector, follow that hose and it leads to a small plastic and paper filter located by the off side susspesion strut area just in front off the bulkhead, pull the filter off and problem is eliminated!! Anyone else who gets this problem - Just take the filter off and run it for a while, must be the easyist / cheapest first test!! WV filter part number: 702 129965 MF5 Forget Ford dealers, they cant trace this WV part number. Also, if anyone needs an N75 Valve, shop at VW dealer rather than Ford, VW price