EGR Valve Position (EVP) Sensor
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, and 1995 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
EVP sensor detects EGR valve position. This information is transmitted to the PCM. The sensor is mounted on the EGR valve. The EVP signal affects EGR flow.