It has failed on its emissions
reading-CO actual value 1.284
Lambda actual value 0.962
RPM was pass and HC was pass
l have now replaced the plugs and air filter(which was clean anyway but still replaced) and l have added some Catacleanl wanna avoid replacing the llambdasensor as when it was plugged into the ddiagnostic comp it was showing as being fine, what else can l do to get it a pass ??
thanks vicky

Might sound a bit extreme but have you driven the car hard at all?
l suggest a drive down your local dual carriageway keeping within the speed limits and make the engine work harder than normal ie 70mph in 4th gear do not select 5th or 50mph in 3rd gear, do not over rev it just make it work, this will help to clean out the catalyst, the catalyst works better when it is warmer. l suppose what l am trying to say is give it a good run!