Mazda Millenia Catalytic Converter Bank - P0431?

[BradleyR]

We have a 1999 Mazda Millenia S with the Miller Cycle engine. Three weeks ago I asked about service code P0431 and I received some answers. I continued to research this issue and I found tha Mazda issued service bulletin 01-003/01 dated Feb 28, 2001. The bulletin indicates that the problem could be caused by oversensitive rear O2 sensors. This problem started when we had all 4 O2 sensors replaced about two years ago. Other service info says that the problem can be caused by corroded terminals on the O2 sensors. Has anyone resolved a problem with DTC code P0431 without replacing the catalytic converters?

[waleedi]

yes i am having the same prooblem with my 99 millenia s it said warm up catalyst temperature below threshold bank 1 and bank 2 idk what to do they want 900 dollars for the bank 1 convertor.

[waleedi]

yes i am having the same prooblem with my 99 millenia s it said warm up catalyst temperature below threshold bank 1 and bank 2 idk what to do they want 900 dollars for the bank 1 convertor.

[NalgemiaFag]

Hello. And Bye.

[NalgemiaFag]

Thank a lot good post!

[erusarer]

Rather valuable message