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If your BMW Z3 Air Flow Meter keeps failing the issue is most likely to much oil on a BMW performance air filter, or to much blow by from the Z3 engine.
If your BMW Z3 Fuel Injector has failed, be sure to replace the fuel injectors in complete sets. We have some of the the best prices on Bosch BMW Z3 Fuel Injectors with free shipping.
The BMW Z3 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 BMW Z3 diagnosics codes for proper replacement of the O2 Sensor.