p0431 code 04 Mazda6 3.0L which front bank 2 sensor 1 or 2 should i replace

Question

hi, i have a 2004 Mazda6 3.0L with a p0431 code and i want to know which front 02 senor (bank 2) upstream or downstream should i replace to solve the issue?

Answer 1

Hi there,

This code is actually for the catalityc converter. Since it is bank 2, you would replace the converter on the front of the engine closest to the radiator.