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The code PO404 on a 2000 Mazda Millennia 2.3 means that there is something wrong with how the vehicle is processing the oxygen it needs for combustion. This would mean an oxygen sensor or solenoid is bad. This vehicle has two oxygen sensors.

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9y ago
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Q: What does code P0404 means on a 2000 Mazda millenia 2.3?
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