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2000 honda crv 90k miles p0420 code, what is usually the problem

Resolved Question:

2000 honda crv 90k miles p0420 code, what is usually the problem ?
Submitted: 4 years ago.
Category: Honda
Expert:  Dan replied 4 years ago.

The problem is almost always the Catalytic Converter, let me know if you have questions. Thanks

 

P0420 Catalyst Efficiency Below Threshold (Bank 1)

Possible CausesSetting Conditions
  • Check for air leaks at the exhaust manifold or in the exhaust pipes
  • Catalytic converter damaged or has failed (deteriorated)
  • Check for poor fuel quality and/or contaminated fuel
  • Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
  • Front HO2S or rear HO2S is contaminated with fuel or moisture

Dan, Technician
Category: Honda
Satisfied Customers: 21486
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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