[bluezie]

I assume you are talking about a 1.9PD? AFAIK there is no way of checking any fuel pressures on the PD engine using VCDS, and even if you could, that wouldn't necessarily show leaks anyway. There are 2 main types of leaks, injector dribble which causes white smoke on start up and on extended idle periods, and O ring leaks, where the fuel rail is leaking into the oil. Slight O ring leaks can be detected by smelling for diesel in the oil filler when the engine is hot, and as said above, major leaks will cause a noticeable rise in oil level.
What makes you think the injectors are leaking?