Output Shaft (Countershaft) Speed Sensor Replacement

Raise the vehicle upon a lift, or apply the parking brake, block both rear wheels, and raise the front of the vehicle. Make sure it is securely supported.
Remove the transmission undercover (A) and splash shield (B).

Fig 1: Transmission Undercover And Splash Shield With Torque Specification
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the damper from the front subframe.

Fig 2: Damper With Torque Specification
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the output shaft (countershaft) speed sensor connector, and remove the output shaft (countershaft) speed sensor (A) and sensor washer (B).

Fig 3: Output Shaft (Countershaft) Speed Sensor And Sensor Washer With Torque Specification
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the new O-ring (C) on the new output shaft (countershaft) speed sensor (B), then install the output shaft (countershaft) speed sensor and sensor washer.
Check the connector for rust, dirt, or oil, then connect it securely.
Install the damper on the front subframe.
Install the splash shield and transmission undercover.