You remember our last case study. Well, I am called back to this shop because the vehicle left running well then a week later it has issues and a MIL lamp on. At this point do we have another issue? I arrive and start the car which seems to run pretty decent but the MIL is on for sure. I retrieve a code P0102 (Mass Air Flow Sensor Circuit Low). Hmmmm. Well, I do my checks and guess what? The culprit is a bad remanufactured Mass Air Flow Sensor. This car left a week ago with 137,052 miles on it and here it is with 137,182 with a bad MAF.
So what do I do here? It is not my fault this part failed right away. Do I charge the shop owner again to diagnose? He is one of my best customers. I take one on the cuff and inform the shop owner to only use a quality MAF sensor. We both live to fight another day.