hi all,been a memeber for awile but this is my first post, so here we go !! not had much time to look at this one yet, but had a citroen saxo 1.6 16v VTS, P reg bought to me today, failed the MOT test on emissions, second fast idle at 0.6 CO, lamdba and HC fine, did a quick plug in with the `happy snappy`, no fault codes stored and from what i could tell everthing in live data is working fine. The car has had a new cat on it last week, so cleaned the throttle body area out and ran some forte treatment through it but after a good run still reading 0.6 CO. From live data the lamdba is switching and the coolant temp sensor seems to be working ok. Can anyone point me in the next direction please !!