Prelude L4-1958cc DOHC (1989)
Transmission Speed Sensor: Service and Repair
1. Remove the 6 mm bolt and the mainshaft speed sensor from the right side cover.
2. Remove the 6 mm bolt and the countershaft speed sensor from the transmission housing.
3. Replace the O-ring with a new one before installing the countershaft speed sensor or the mainshaft speed sensor.
