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cod p0420 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 tat125 New User Oct 25, 2009, 2:35 PM Post #1 of 3 (3988 views) cod p0420 Sign In 1999 nissan altima engine 2,4 162000 mileages. First time appear the cod p0420. I checked exhaust system for leak and replaced rear oxygen sensor.Engine worked good and cod did not eppear. But after 250miles appears cod p 0171. I checked intake system and replaced lower intake manifold- to cylinder-head gasket,because the engine missed at idle speed. After it engine runs good, but again appears cod p 0420. Who can help me. Thank You. Loren Champlain Sr Veteran / Moderator Oct 25, 2009, 2:49 PM Post #2 of 3 (3969 views) Re: cod p0420 Sign In PO420 is low catalyst efficiency. Almost always meaning the cat is dead. P0171 is system lean. A poor running engine can, and will, destroy a cat. Need to address the P0171, first if it is still present. (a dead cat won't cause a drivability issue, but a plugged one will). Loren SW Washington Hammer Time Ultimate Carjunky / Moderator Oct 25, 2009, 2:50 PM Post #3 of 3 (3969 views) Re: cod p0420 Sign In The PO420 is a bad Catalytic Converter. It took a while to reset because it's a marginal call plus is takes a whole bunch of factors to qualify for that code and it takes a while for them all to come up. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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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