Live Longer, pay a mechanic on this one my friend.
The Millenias and their Commonwealth cousins the "Xedos" all suffered a common defect resulting in MOST CEL issues. This engine configuration typically results in the need for replacement of 1 to 2 O2 sensors and / or the DREADED KNOCK Sensor embedded deep in the Manifold assembly. Mine ran 3 years with this CEL on due to the cost of labour one item to replace. The sensor was only 165 bucks while the labour to install was nearly 800.
I will admit once it was replaced I was not only legal again for the Emmissions test, but the thing ran smoother than it ever did ina ll seasons PLUS I got nearly 2 points to my highway Mileage.
Now the codes are confusing on this because two of the O2 sensors share the same circuit and the code wont necessarily identify WHICH o2 is actually bad, that unfortunately is hit or miss. The KNOCK sensor code is separate and distinct however but all will result in a costly set of repairs.
Good Luck
It is a nonservicable part, just replace it.
replace your MAF sensor.
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When that happened to me it was the sensor to the air filter. I had to replace the air filter and sensor.
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it has 4 o2 sensors #1 cylinder is sensor 1 or bank 1 sensorType your answer here...
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Depends on Which Year and Which Engine (2.3 or 2.5) My 99 2.5L has 4 o2 PLUS a knock sensor
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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.
The throttle position sensor is on the throttle body.