This specific diagnostic trouble code indicates that the catalytic converter is not operating at the efficiency level expected by the vehicle's computer. Oil leaks that contaminate the catalyst can also trigger this code.
Professional Diagnosis for P0420 in Your 2006 Nissan Altima
Potential Cause Likelihood Severity if Ignored Failing Oxygen Sensor High Medium Engine Misfire Medium High Exhaust Leak Medium Medium Contaminated Catalyst Low High Diagnostic and Repair Procedures Proper diagnosis begins with a thorough inspection of the ignition system and fuel delivery system. In rare cases, a sulfuric or rotten egg smell emanating from the exhaust can indicate the catalyst is overheating or breaking down internally.
Using an OBD-II scanner to check for pending codes and live data from the oxygen sensors is essential. Some drivers also experience a slight loss of power or hesitation during acceleration.
Professional Diagnosis for P0420 in Your 2006 Nissan Altima
Additionally, a misfire caused by worn spark plugs, ignition coils, or a leaking head gasket can send unburned fuel into the converter, causing it to overheat and fail prematurely. The vehicle's Engine Control Unit (ECU) monitors the efficiency of the catalyst by comparing the readings from the upstream and downstream oxygen sensors.
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