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If your Toyota FJ Cruiser Air Flow Meter keeps failing the issue is most likely to much oil on a Toyota performance air filter, or to much blow by from the FJ Cruiser engine.
The Toyota FJ Cruiser 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 Toyota FJ Cruiser diagnosics codes for proper replacement of the O2 Sensor.