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HONDA ACCORD P0420 CODE | Catalyst Efficiency Below Threshold Bank 1
Signs you need a new catalytic converter when you get a P0420 code
2006 Accord SE Codes P0420 & P0171 - Honda Accord Forum - Honda Accord
CODE P0139. O2 SENSOR REPLACEMENT FOR HONDA ACCORD 2003-2007 - YouTube
Honda Accord Check Engine Light Code P0420 | Decoratingspecial.com