Thanks Lee.
Well... it did have a DPF when I bought it. The car was fine on a test drive and passed the documentaion and VCDS tests. It was a great price too from a used car foreourt (this was nearly 6 years ago). So I bought it and drove 120 miles home.
Over the next few days it lost more and more power until it was asthmatic and the turbo would get very hot and had started to leak exhaust gas from the gasket between the two halves (castings). I took it to Audi who said it looked like the turbo was faulty, I was annoyed and bought a new turbo and after getting a small VW indie to fit it - it was exactly the same. We scratched heads and eventually they disconnected the exhaust and went down the road and it was like a different car. They said the DPF or exhaust was - blocked but there were no warnings. They said I needed a new DPF for £1200 but I wasn't convinced as no warnings about regen, I though I will do a regen (the garage was a bit traditional and normally just does old lady's Polos etc..) and the option was greyed out in VCDS and the soot level measuring blocks were blank.
I looked more into VCDS and it said there was a flash of engine ECU 3 weeks before I bought it - it was under the Identification tab - no. of flash attempts =1 Sucessful flash attempts =1
Hmmm, it seemed like the DPF had been flashed-out in software but the DPF was still there and was now blocked. We found the pre-cat next to the turbo behind the engine had been cut in half and neatly welded back up. It looks like someone did a DPF removal but removed the pre-cat instead (as that is where the DPF is on later variants). So...they removed the soot and soot trap and everything was fine.
During the repairs, I called the seller who sounded sympathetic but the phone stopped ringing the second week. To cut a long story short they had gone bust and were struck off. Nevermind, I was still a few grand up all in all.
I don't know what software is on my ECU or who did it, whether it also gives performance boost but it has been fine for 5 years and the car now has 250,000 miles.
Aha- I think you gave me the lightbulb moment....Sounds like the measuring block 003 labels are wrong/misleading and are really MAF readings?
So 487 actual - 411 specified means 76 of EGR is being specified and the EGR should be opened until the actual MAF is brought down to match the specified MAF?
Attachment 14071