OK, I have, over the last hour or so, debating my options here. I suspect it's the cat/cats at fault here. It's only had a new lambda in the last 5000 miles. Smoke or no smoke, I just can't see it. So what does that leave? Well, that leaves us with the minorly expensive option of a new cat.
The reason behind this suspicion being that the engine is pulling and behaving very well. If the lambda was false reporting, for whatever reason, I would expect it all to go to sh*t and it to be down on power or something. Basically, have some other side effect other than having gash emissions....
So, I think I have a plan.
New lambda. Order monday, arrive Tuesday. Fit Tuesday night. Retsest Wednesday. Probably laughably fail again. Cry, and go home.
I've been looking at sports cats on the bay. Pipewerx one comes in at £487 delivered (
http://cgi.ebay.co.uk/Audi-TT-S3-3-...arts_Vehicles_CarParts_SM?hash=item45ecfcabec). There is also a cheaper one on there which I have never heard of for £320 or best offer. I expect that would be bought for £300 plus delivery. Not convinced of the quality though (
http://cgi.ebay.co.uk/Audi-VW-TT-S3...arts_Vehicles_CarParts_SM?hash=item35a81d6223). Anyone who's got experince of these, jump in any time.
I would go with the pipewerx one I would imagine.
So, that's £487. And due to them being such an utter b*tch to fit, I wouldn't be doing it. So that would be plus labour to fit. Est total £600. Ouch. Plus Lambda. £685.
I have also phoned up Longlife down the road from me in Berkeley. They can do me a 3" downpipe, and 200 cell sports cat with a lifetime waranty for £550 fitted. Plus Lambda. £635.
All of this based on the fact that it's not the lambda gone wrong.
So, what would Jesus do?