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Hi Aragorn - thanks for that - 'OBD'/dual sensor it is then. The sensors are still a slightly worrying puzzle though. Unless I am completely losing my marbles there was a sensor just in front of the cat box. The section of exhaust seemed to be 3-bolted to what looked like manifold flange at...

Hi - I posted this below on VW/Au forum but no nibbles yet and time is ticking unfortunately - Can anyone here throw any light on this? Does the fact that I get cat efficiency fault code mean it must be a dual sensor setup or can this still be raised if there is only a single lambda sensor ...

Hello Audi people - Clarification about the discussion in this thread about "non-OBD" when it comes to buying a downpipe/cat (mine is a 2000/X-reg A4 B5 V6 non-quattro 2.4 SE (manual)). I have the same question about whether a 'non-OBD' part is OK. I've got fault codes o420 and 0430 for 'cat...