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Mass Airflow Sensor

The mass airflow (MAF) sensor measures the mass (or weight) of the air as it passes through the throttle body to the intake manifold. It transmits this information to the engine control computer, which helps control the fuel-to-air ratio.

Symptoms of a Bad or Failing Mass Airflow Sensor

  • Engine may run roughly or not at all
  • Poor performance
  • Excessive fuel consumption
  • Stalling
  • Check Engine Light may come on or blink

Mass Airflow Sensor Related Repair Advice

  • To prevent damage to the new mass airflow sensor, all dirt and debris should be cleaned out of the air filter housing and a new air filter installed
  • Mass airflow sensors (MAF) are often replaced when the problem is actually a bad connector or the sensor wiring harness.
  • High-performance style wet foam air filters are not recommended because they will damage the mass airflow sensor and cause poor performance
  • The air duct work between the mass air flow sensor and the intake manifold should be inspected for damage whenever the sensor is replaced

2 User Comments

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I just bought a 1997 ford expidition/eddie bauer/ having problems with it not wanting to go when I step on excellorator! Is the replacing of the mfs easy or hrd? I am not too wealthy here, fixed income, hopin not too costly. Is this also to do with how the "tac" doesn't work correctly, if at all!! Tranny issues?? I'm told could be that?/ Need good honest person to tell me what to do.
Can the MAS be the reason why a c240 4matic be shooting ??