If the converter fails to burn off excess oxygen and hydrocarbons effectively, the signals from these two sensors become too similar, triggering the warning light. Decoding the P0420 Code The P0420 code is a generic OBD-II diagnostic trouble code that translates to "Catalyst System Efficiency Below Threshold (Bank 1).
Achieving Nissan Altima 2006 P0420 Emissions Test Pass
Common Symptoms Beyond the Check Engine Light While the illuminated check engine light is the most obvious sign, owners of a 2006 Altima often report several other symptoms that accompany this code. This specific diagnostic trouble code indicates that the catalytic converter is not operating at the efficiency level expected by the vehicle's computer.
Some drivers also experience a slight loss of power or hesitation during acceleration. 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.
Nissan Altima 2006 P0420 Emissions Test Pass
The vehicle's Engine Control Unit (ECU) monitors the efficiency of the catalyst by comparing the readings from the upstream and downstream oxygen sensors. " In the context of a Nissan Altima 2006, this specifically refers to the main catalytic converter located downstream of the engine.
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