Comments by "Mikko Rantalainen" (@MikkoRantalainen) on "AFM vs. MAF vs. MAP - Air flow SENSORS - HOW they WORK and how they DIFFER from each other" video.

  1. VW TDI engines use both MAF and MAP sensors and their measurements must match or the ECU will cut down the power. They can only detect leaks in turbo boost pipes if both sensors work correctly because in that case MAF sensor will show all the air going to turbo but MAP sensor will see some of the air missing. Broken EGR valve can also mess the manifold pressure which is measured by MAP sensor.
    1