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Ford Code P0420-- 91 Mercury Tracer 1.9 Automatic
Posted to Technical Discussion Forum on 12/3/1998 1 Reply

Vehicle arrived with 78,000 miles..Check engine light on..< --Found very restricited fuel filter -- Replaced. < --Found manifold 02 sensor lazy -- Replaced. < --Replaced Cat or rear 02 sensor. < --Cat-convertor tested good -- CO test -- Rattle test -- Cold sta... Login to read more.

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