If your Mazda Millenia Air Flow Meter keeps failing the issue is most likely to much oil on a Mazda performance air filter, or to much blow by from the Millenia engine.
The Mazda Millenia Oxygen sensor is a critical part of the emmision control system and should be replaced as soon as it fails. Make sure to check the Mazda Millenia diagnosics codes for proper replacement of the O2 Sensor.