Focus rs emission proplems,just took to mot today everything good untill got to do the emissions test,usually when it fails on the emissions i put fuel cleaner through it and take it for a run and that normally sorts it,this one though is way out on the carbon monoxide content,does anyone know what this could be to sort it,one thing is ive only just bought it and there is a receipt in there for a new air cleaner assembly which was put on there a few days ago,could this be anything to do with it?
Any help would be greatful!
Thanks
gavin

 

The emissions printout should give you a very big clue, usually down to the lambda sensor.
tabetha

 

Has it got a cat fitted?