The VSS also known as Vehicle Speed Sensor which is located on the upper part of the transaxle is an electrical circuit part that create an oscillating voltage in the circuit as the shaft of the sensor turns. The PCM watches these voltage pulses to help control the fuel and ignition also transaxle shifting. To sort the VSS, the first step is to seize the electrical connection together with the sensor to be disconnected from the transaxle, next is the removal and replacement of the O-ring before reinstalling the VSS in the reverse order.