Output Shaft (Countershaft) Speed Sensor Replacement

Raise the vehicle on 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 splash shield (A).

Fig 1: Identifying Splash Shield
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the damper from the front subframe.

Fig 2: Identifying Damper From Front Subframe Bolts
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: Identifying O-Ring On Output Shaft (Countershaft) Speed Sensor
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, and if clean necessary, then connect the connector securely.
Install the damper on the front subframe.
Install the splash shield.