Bad MAF Sensor or Vacuum Leak? Read Live Data and Fuel Trims Like a Pro

About this video

Got a P0101 or P0103 code, or wondering if your MAF sensor is bad? In this video, an ASE certified mechanic explains how the mass air flow sensor works, how to read MAF live data on a scan tool, how many grams per second is normal, and how to tell whether the MAF is really bad or something else is fooling it. We also show how the MAF, fuel trims, and oxygen sensors all work together, so you stop replacing sensors that were never the problem.