Question

2002 Nissan Frontier with engine code P0420 Catalytic Converter. I know a converter is clogged, but which one? It has four! The code says bank one.

Answer 1

Hi there,

This is the passenger side converter right off the exhaust manifold. The one in between the 2 O2 sensors.

Answer 2

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