Engine Code P0420: Catalyst System Efficiency Below Threshold (Bank 1). It indicates that the Catalytic Converter is not functioning efficiently, so the vehicle is increasing the output of harmful ...
Answer:You have two catalytic converters on the Nissan Pathfinder 3.5-liter, one for each three-cylinder bank of the engine. Typically engine bank 1 is the side including cylinder #1. In your case, it ...
Answer:That's a new one for me, and I cannot see it having any effect on preventing a P0420 DTC, but it is illegal. P0420 indicates the catalytic converter has lost its efficiency in reducing harmful ...
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