The VSS consists of a magnetic rotor which is rotated by the speedometer cable and a reed switch. Rotation of the magnet rotor pulses the reed switch OFF/ON to produce a digital signal. The signal is used as a vehicle speed coefficient in ECU calculation.
The Impreza has 2 Vehicle Speed Sensors (VSS): VSS1 is located on the right side of the transaxle case housing; VSS2 is located in the combination meter assembly.
The Legacy has 2 Vehicle Speed Sensors (VSS): VSS1 is located inside of the transaxle; VSS2 is located in the combination meter assembly.
The SVX has 2 Vehicle Speed Sensors (VSS): VSS1 is located on the right side of the transaxle case; VSS2 is located on the right side of the torque converter case. The VSS1 detects rear wheel speed and the VSS2 detects front wheel speed.