P0431 Kia - Sorento 2004

Question

P 0431 Warm up Catalist Efficiency Below Threshold Bank 2

Answer 1

P0431 Catalyst circuit malfunction Bank 2

This code can go both ways, a failed catalytic convertor or a downstream 02 sensor that has failed, The best way to resolve this code is use a scan tool and look at the data to see what is at fault

​ Here is a failed rear or downstream 02 sensor , which set a catalytic below threshold code

​ After the replacement of the rear downstream 02 sensor ,  a good rear 02 sensor