The speed sensor is located on the transmission, near the rear of the engine. It is a small, cylindrical sensor with a wire connector. To remove the speed sensor, you will need to:
1. Disconnect the wire connector.
2. Unscrew the sensor from the transmission.
3. Remove the old O-ring from the sensor and install a new one.
4. Screw the sensor back into the transmission.
5. Connect the wire connector.