Recently purchased a 99 Cougar (cheap) with 152K along with engine light On as a gift.. The car runs great and has lots of power.. V6 24 Vaule....Used my Davis Car Chip to analyze Engine Light...Came up with 2 code mentioned below...Used Motor Flush (Kerosine) On Engine Changed Oil and Cleaned injectors and Throttle body...Used my Davis Car Chip to reset codes.. They have not came back.. Hope this helps.. Davis Car Chips found on ebay.. Nice little gadget....


I will eventually replace the Catalytic Converter....


P0401 Exhaust Gas Reciruclation Flow Insufficient


P0420 Catalyst System efficiency Below Threshold


Hope this Helps...


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Here's how to understand and repair a P0401 trouble code

P0401

Cleaning throttle body passages