Hey man! U live in Norway right? I live in Eidsvoll. And I got VAG-COM that may set us on the right track.

I bought a sparepart/donor V8 for my V8 project a fiew years ago. It had the same problem. And I`m planning to use that particular engine for my car when I`m done. So for that reason allso, It would be interesting to try to help you...
(Guess cars aren`t moderne anymore when I`m finished...)

Have you checked the signal? I belive you wrote that it was 0,0-0,7 volts. the important indication is wether or not the signal oscilates (goes up and down). If it does not - (After the engine is worm) the lambda is screwed!

Looking forward to hear from you!
Per-Stian