Catalyst system efficiency below threshold bank 1 what that means on murano 2005

Question

I got code p0420 on murano 2005

Answer 1

Means that the vehicle's control computer has detected that the catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.