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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?

Vehicle: 2004 Mazda6 3.0L

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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.

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