The code was P0420-Cat efficiency below threshold from bank 2 converter, They cleared the code and said that and told me to come back if it comes in.When attach a trouble code reader and come up with a P0420, your first assumption may be that you need a new catalytic converter, simply because the words catalytic converter are mentioned in the code. How to fix Code P0420 What is code P0420 Catalyst System Efficiency Below Threshold.Your Honda dealer will have to _verify_ eligibility _before_ this repair can be considered for goodwill warranty coverage (coverage beyond the standard. A check engine light with codes P0420, 1420 or 2000 _may_ be caused by overly sensitive programming in the ECM (engine computer) and is correctable for the above models by an ECM 'reflash'.As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).

(26960 Views) Photos: How To Calculate Fuel Consumption / What Is The Cheapest Way To Deal With P0420? / Catalyst Code P0420 & Knock Sensor Code P0328 On My Nissan Maxima Nairaland Forum / Nairaland / General / Car Talk / P0420 Code Fix, High Fuel Consumption To Be Fixed. P0420 Code Fix, High Fuel Consumption To Be Fixed.There aren’t usually any drivability issues associated with P0420. Typically, the code will be triggered by the upstream oxygen sensor (before the converter). The P0420 code in a Ford F150 will often be thrown one of your oxygen sensors are not functioning properly.The P0420 code is set when the Catalyst monitor sees a decrease in voltage from the rear Monitoring Oxygen Sensor(s) and an increase in switching activity-from rich to lean to rich, etc.-that closely resembles the front Oxygen Sensor(s) during the time the computer is activating the Catalytic Converter monitor test.

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