Had the lupo in for its mot and the only thing I don't know how to sort is how to lower the co output. The limit it said is .3 and I was .6 and .57 both times
Ive had a new cat in the last 6months and changed the oil recently. What next should I try?
Should I change the spark plugs and air filter or would additives make a bigger difference?
As usual all help is appreciated