You need to start the Transmission Position Switch/Sensor replacement process by taking off the Engine Under Cover Sub-Assembly No.1 and the Engine Under Cover Assembly Rear. Start by disconnecting the Park/Neutral Position Switch Connector before you remove the Park/Neutral Position Switch Assembly by unlocking the lock washer then taking off the nut and bolt with its attached switch. Screw the new Park/Neutral Position Switch Assembly to its place with the bolt and tighten it to 13 Nm (130 kgf-cm, 9 ft. lbs.) before adding a fresh lock washer and nut to 7 Nm (71 kgf-cm, 62 inch lbs.). Then bend the locks of the lock washer to secure the nut. The service procedure demands you should adjust the Park/Neutral Position Switch while you reconnect the Park/Neutral Position Switch Connector before you reinstall both the Engine Under Cover Assembly Rear and Engine Under Cover Sub-Assembly No.1. Close the inspection of the Park/Neutral Position Switch Assembly.