Output Shaft Speed (OSS) Sensor

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The Output Shaft Speed (OSS) sensor is a magnetic pickup that provides transmission output shaft rotation speed information to the Powertrain Control Module (PCM).
The Output Shaft Speed (OSS) Sensor is mounted externally on the top of the transmission extension housing.
The PCM uses the OSS sensor signal to help determine Electronic Pressure Control (EPC) pressure, shift scheduling and Torque Converter Clutch (TCC) operation.