PO420 and PO430 error codes
Asked by SonyaF40 Nov 14, 2018 at 09:11 AM about the 2003 Nissan Altima 3.5 SE
Question type: Maintenance & Repair
My vehicle started out with a slight miss and
decreased power on an incline. It is now missing
terribly, same power issue, strong fuel odor and
service engine light blinks off and on.
2 Answers
well first off if your engine light is blinking DO NOT drive it or even run it till you get these two codes fixed or else you could make it worse - the P0420 Code is: Catalyst System Efficiency Below Threshold Bank 1 and the P0430 Code is: Catalyst System Efficiency Below Threshold Bank 2 Possible causes for P0420 : Faulty Three-way Catalyst Converter Bank 1 Exhaust Tube Intake Air Leaks Faulty Oxygen (O2) Sensor Faulty Fuel injector(s) Leaking Fuel Injector (s) Faulty Spark plugs Improper Ignition Timing Faulty Engine Control Module (ECM) Dirty Air Filter Possible causes for P0430: Faulty Three-way Catalyst Converter Bank 2 Exhaust Tube Intake Air Leaks Faulty Oxygen (O2) Sensor Faulty Fuel injector(s) Leaking Fuel Injector (s) Faulty Spark plugs Improper Ignition Timing Faulty Engine Control Module (ECM) Dirty Air Filter i hope this helps.
Any opinions would be appreciated