ford galaxy 2.0 dohc petrol p reg. will not pass co emission test.a cat as been fitted and as brought the co down quite a lot.have tried new hego sensor,mass air sensor,changed exhaust manifold gaskets. please advice on any ideas. thanks
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Obvious suggestion, but has the air filter become dirty?
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Italian tune up?
Change the air filter, throw in a bottle of valv-eez, and take it for a hi-rev run of about 100 miles.
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