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2004 monte carlo, 2 codes Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes waylon83 User Mar 14, 2011, 7:57 PM Post #1 of 4 (5501 views) 2004 monte carlo, 2 codes Sign In 2004 Chevy Monte Carlo 3.8L Not super charged 104,000 I am getting these engine codes: P0420 P0455 Whats my best bet at figuring out what the problem is? Hammer Time Ultimate Carjunky / Moderator Mar 14, 2011, 8:09 PM Post #2 of 4 (5494 views) Re: 2004 monte carlo, 2 codes Sign In You probably left the gas cap loose for the PO455 and the PO420 means you most likely need a new catalytic converter. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. waylon83 User Mar 14, 2011, 8:17 PM Post #3 of 4 (5489 views) Re: 2004 monte carlo, 2 codes Sign In Gas cap isnt loose, ive had that code for a while now, have a new gas cap on now from the dealer. Is there a way to check the catalytic converter or do I just replace it and hope? Hammer Time Ultimate Carjunky / Moderator Mar 15, 2011, 5:17 AM Post #4 of 4 (5487 views) Re: 2004 monte carlo, 2 codes Sign In If it's not the gas cap, then you have a major leak elsewhere in the system and you will need a smoke machine to find it. As for the Converter, there is no good way to test it. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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