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If your Mazda Tribute 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 Tribute engine.
If your Mazda Tribute failed the emissions test due to high NOX, the EGR Valve is most likely the issue. If your Mazda is running rough or has poor fuel mileage, replace the Tribute EGR Valve and gasket.
The Mazda Tribute 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 Tribute diagnosics codes for proper replacement of the O2 Sensor.