Originally Posted by
RichieST
CO is unburnt fuel I think. Could be a knackered cat, poor ignition. I'd pull the plugs out of it and check to see if they are a light greyish / brown colour. If they are sooty then something isn't right. What year is the car? What sort of use does it get?
thanks for a sensible reply, car is used daily but never thrashed, its a 2001 generation 6, here are some pics of the plugs ive just replaced
there are no fault codes stored or pending, engine is also not down on power as i'd expect with a blocked cat.