I noticed in another thread someone mentioned the VAG COM software for engine diagnostics. I've just looked into it and it seems there are many versions of not only the software but the cable too.

Does anyone know which version of the software I would need and which cable I would need for a Mk5 Golf GTTDI 140? There is all this talk of CAN and non CAN and from my googling I can't work out which is needed.

If I need the CAN feature does that mean the cheapie cables off ebay won't work?