MFA sensors are used to check mass airflow going across an engine. This is displayed by the voltage signal going into the engine and determines how much fuel should be injected into the engine cylinder. The onboard computer inside the vehicle controls the MFA sensor. If the sensor is not working properly, the engine to the car will shut off sporadically. You don't have to be a car mechanic to check the MFA sensor on your car. You can do it yourself with just a few tools.
Instructions
1. Locate the sensor schematics for your car. This can be found in the owner's manual. If you don't have the owner's manual, you can order one through an online retailer or though the car manufacturer.
2. Locate the MFA sensor inside your car. This is usually found between the air cleaner and the throttle body. Connect a sensor scanner to the MFA sensor valve.
3. Start the car. The car must be at idle for the scan tool to get an accurate start reading of the MFA sensor. Record the reading of the MFA sensor at idle.
4. Have a friend gently push the accelerator on the car to take the car out of idle. Record the MFA sensor output while the car is at a steady RPM, or revolutions per minute. If the sensor readings do not differentiate between idle and with an increased RPM, the sensor must be replaced.
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