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2001 Nissan Pathfinder SE 3.5L with engine code P0420, what is the solution?

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2001 Nissan Pathfinder SE 3.5L with engine code P0420, what is the solution?

Vehicle: 2001 Nissan Pathfinder SE 3.5L

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Best answer
Could be a bad O2 sensor or even bad gas, but more than likely is a bad catalytic converter.

P0420 NISSAN - Catalyst System Efficiency Below Threshold Bank 1
Read more: https://www.autocodes.com/p0420_nissan.html

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