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Where is location oxygen sensor 2 bank1 for 2003 Mazda 3.0L V6?

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Where is location oxygen sensor 2 bank1 for 2003 Mazda 3.0L V6? I have the engine code P0031

Vehicle: 2003 Mazda 3.0L V6

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Bank 1 is the bank closest to the firewall, the #2 sensor is in the exhaust AFTER the catalytic converter.

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