2006 Acura MDX Code P420: How to Fix Oxygen Sensor or Catalytic Converter Issue?

Model: Accura MDX Fault Code: P0420 Posted: 2015-02-28 13:45

My 2006 Acura MDX has triggered Check Engine Light with Diagnostic Code P420, which indicates a possible catalytic converter issue. The vehicle was previously recalled for catalytic converter problems, and I'm now concerned about whether this code is related to the recall or a separate malfunction. Some mechanics suggest an oxygen sensor failure as the root cause, while others recommend replacing the catalytic converter. A few even claim that cleaning the converter will resolve the issue. I'm confused—what's the correct diagnosis and fix for P420 in a 2006 Acura MDX? Any reliable guidance or troubleshooting steps would be greatly appreciated.