I never had a problem with my Audi in the 6 weeks I had it. Hang on, I think the fact it was shaped liked an 'L' last time I saw her might have been a small problem. Thank god for it's 6 million airbags is what I say.
Picked up Maf for £20 from local breakers. Worth a shot as used ones are going for £50 on eBay so even if it's not that I'll get money back. New code reader got delivered today as well. So. Jobs for tomorrow!
Open the bonnet and stare at it, occasionally rub your chin, then wiggle a few leads around. After that, pull the dipstick out, wipe and replace. Rub chin one more time, only this time follow it up with a head scratch. Get into car, turn it on, rev the engine a few times then sit and look like you're listening. Then turn the engine off and get out. If that doesn't work I've no idea.
I guess you've already tried Audi forums for common faults too? I've heard a few complaints about the 2.0t units but can't recall any specifically other than cam chain tensioners failing?