When the computer observed an increase in rear prop speed as a result of the axle popping out, it determined the front vehicle speed sensor as being faulty due to it decreasing in rpm. Of course the loss of rpm was due to the loss of power. The computer either didn’t or couldn’t distinguish the difference. Nonetheless, the front vehicle speed sensor was being blamed when nothing was wrong with it or the transmission. Considering the strain this had on the transfer clutch with the axle popping in and out, it explains why they were burnt originally.