P0420 HONDA Catalyst System Efficiency Bad Cat

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Repair Information for P0420 Honda code. Learn what does P0420 Honda Catalyst System Efficiency Below Threshold Bank 1 means and how to diagnose p0420 code • Here is a link to my follow up video, P0420 Honda CRV Advanced Diagnostics Complete Guide • • P0420 Honda CRV Advanced Diagnostics ... • The only reason the cat was replaced on this car was due to rust and it set the p0420 the day after. • 1999 Accord 2.3 • 2000 Accord 2.3 • 2001 Accord 2.3 • 2002 CR-V 2.4 • 2003 CR-V 2.4 • 2004 CR-V 2.4 • 2005 CR-V 2.4 • 2006 CR-V 2.4 • Customer Concern: The Check Engine Light (CEL) is on with a code P0420 Catalyst System Efficiency bank 1 • Average Reported Mileage: 122756 • Tests/Procedures: 1. Verify that the fuel trims on both banks are good at idle and when driving the vehicle. It is possible to have the fuel trim at 20% and not set a fuel trim code and cause the catalytic converter to not function properly. • 2. If the fuel trim is only off on one bank, look for a faulty Air/Fuel (A/F) Ratio sensor, a vacuum leak or a fuel delivery problem on the bank the fuel trim is off on. • 3. If the fuel trim is good and within 10% plus or minus, drive the vehicle at a steady throttle, steady cruise and monitor the rear O2 sensor operation. If the rear O2 sensor is switching rich to lean, the catalytic converter is not storing oxygen correctly. When the catalytic converter functions correctly, the rear O2 sensor should not switch. If the rear O2 sensor switches at a steady cruise while driving, the catalytic converters are failing. • 4. Since this vehicle uses Air/Fuel (A/F) Ratio sensors instead of front O2 sensors, if the vehicle has high mileage, it is always wise to replace the front A/F Ratio sensors if the catalytic converters are faulty and need to be replaced. In some cases, the A/F Ratio sensors can cause a false code P0420. • • More about me: • Subscribe to my Youtube channel here: / @flatratemechanic • Facebook fan page: / flatratemech. . • Facebook profile: / reggie.curtis.5 • Google Plus: https://plus.google.com/u/0/106624116... • Linkedin: / reggie-cu. . • Flat Rate Mechanic: http://flatratemechanic.com/ • Instagram: • / flat_rate_mechanic • Reggie Curtis The Flat Rate Mechanic. 25 year ASE Master Automotive Technician and Advanced level ASE certified. #FlatRateMechanic Check out The Flat Rate Mechanics Tool Store on Amazon https://goo.gl/M8MpdC nbsp; • nbsp: • Disclaimer: • Due to factors beyond the control of The Flat Rate Mechanic, it cannot guarantee against unauthorized modifications of this information or improper use of this information. The Flat Rate Mechanic assumes no liability for property damage or injury incurred as a result of any of the information contained in this automotive repair video. The Flat Rate Mechanic recommends safe practices when working on cars or trucks with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this repair video. Due to factors beyond the control of The Flat Rate Mechanic, no information contained in this automotive repair video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.

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