It's my understanding that there is a small mirror that vibrates inside the sensor. There is a vortex generator in front of this sensor that causes the air to swirl and the mirror vibrates at the same frequency. Call it MAF AFM whatever, it is still my opinion that there should be a warning on the can that states it is not safe for all sensors, because it isn't. The average joe that goes into a parts store doesn't know that our cars have a Karmen vortex type "air measuring sensor". From what I understand, and I could very well be wrong Toyota is the only company that used it. Why not put a warning on the can? Like I said there was nothing wrong with my car, ran great, thought cleaning the sensor might help get a more accurate signal, preventative maintenance.
JetJock: Have you ever gotten anything on the back side of a mirror and it takes the shinny stuff off the mirror, maybe some sort of solvent or oil? Wouldn't a situation like that cause the "measuring device" to not work. There are also members of this forum who have put on MHG's with no machine work and they hold, flukes, nothing more. You could go have unprotected sex with Pam Anderson, might not get Hepatitis. You still gonna wear a condom though, right? There should be a warning on the can.