I'm having a bit of trouble working out how to change the top lambdas on my 3.0 quattro avant. vagcom says i've an error in bank 1 and bank 2 I think it was. I can just about get a hand to them but that's it. I can't see how to get access to change the bloody things. I asked my garage to look and they said they reckon the IMs may have to come off. I emailed someone at Stirling audi, who said they may have to lower the gearbox. The downpipes and cats are one. so there's basically a downpipe each side with a pre-cat on the way down and then the full cat, then the flange. All in all it's a bit mental in there and I'm hoping someone can give me a bit of advice.