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Engine code PO431 on 2003 Mazda 6 meaning? Problem? Easy fix?

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It depends on the actual problem.
Code 431 means the catalytic converter is not performing as expected. The computer uses data from the O2 sensors to monitor cat performance.
One of the sensors may be going bad, or the cat may be failing. You would need to monitor the O2 sensor readings with a scanner and watch the temp of the cat to try to assess the problem.

Posted on Jul 15, 2013


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Hi, you can fix it by reading the article found here on P0335 -

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