Mass Airflow Sensor Replacement
How are mass airflow sensor issues diagnosed?
When the check engine light is on, and OBD trouble codes refer to the MAF sensor, the servicing technician will begin by inspecting the vehicle for any indications of physical damage before moving on with testing. A computerized scanner will be connected to the vehicle, and current conditions will be compared to current readings from the various sensors in the vehicle. When these conditions are compared and analyzed, the technician relies on their classroom training to understand which component to test. Once one or more components are suspected of failure, the servicing technician will begin testing with the most likely component, until the issue has been verified through testing.
How is a mass airflow sensor replaced?
Replacing the MAF sensor is generally quick and easy. The sensor will typically be on or adjacent to the intake air tube, and the fastener may be a screw or clip. Once the sensor is replaced, the technician will review sensor data, and confirm the issue has been resolved.
RepairPal Recommendations for mass airflow sensor issues
We always recommend contacting the dealership parts department for revised part numbers. There may be a new part number for the mass airflow sensor, which can be a redesigned part that fixes known flaws. Aftermarket sensors may not have these benefits.
What to look out for when dealing with mass airflow sensor issues
There is a common misconception that when an OBD trouble code is read, the component listed in the code should simply be replaced. This isn't always true, and can lead to expensive and unnecessary repairs. The codes actually refer to engine conditions being reported by sensors. Generic code readers are limited by their minimal programming, and typically are not advanced enough to view and test vehicle specific systems. A "MAF Sensor" title in a code does not necessarily mean the sensor has failed, but rather gives the technician a guide on where to begin their diagnosis.
Can I replace the mass airflow sensor myself?
Almost anyone can replace a MAF sensor. They are typically removed with a clamp, or a screw, and have one electrical connector that can be a little tricky on some models. Otherwise, protecting the sensor while working is all there is to it, and the some vehicles will reset related codes while driving.