- We coated both hot wire and film style sensors with K&N filter oil in
both controlled (laboratory) and uncontrolled (real world) environments
- none triggered check engine lights. We created extreme conditions,
beyond anything an engine would ever experience such as submersing a MAF
sensor in filter oil and monitored the sensor readings while spraying it
with test dust. Even under these circumstances, the MAF sensor was not
damaged. In addition, we were able to take this same MAF sensor, clean
it, and found that the readings were identical to the ones taken prior
to the extreme testing.
- A majority of the “failed” sensors we retrieved from dealerships had
not failed at all. They tested to be functioning within normal operating
parameters as calibrated against new sensors purchased through
dealership parts and service departments.
- Few, if any, automotive dealership service centers have the testing
equipment to authenticate a mass airflow sensor failure.
- Many of the sensors tested were self-contaminated by the silicone
potting compound used in the manufacture of the MAF. Some manufacturers
have issued TSB’s (Technical Service Bulletins) advising dealerships of
the occurrence of MAF’s contaminating themselves with their own silicone
- Sensors fail and are even the subject of full recalls by vehicle
manufacturers. For information on recalls visit:
For a list of our MAF sensor testing results along with the dealerships
involved go to our MAF
Sensor Test Results page.
An In-Depth Look at How Mass Air Flow Sensors Work
Consumer Protection Pledge