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Nissan Micra K13 engine code advice for upcoming MOT Engine Code: P0420 Catalyst system efficiency below threshold bank 1 Any idea about easy fix for this? It comes on and then sometimes goes off by itself, otherwise I can clear the code and it will stay off for a period of time. Probably...

Nissan Micra K13 engine code advice for upcoming MOT Engine Code: P0420 Catalyst system efficiency below threshold bank 1 Any idea about easy fix for this? It comes on and then sometimes goes off by itself, otherwise I can clear the code and it will stay off for a period of time. Probably...