Pressure Feedback (PFE) EGR Sensor & Diff PFE (DPFE) Sensor
WARNING: This page is about a different car, the 1994 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
Faults in sensor or circuit should set a diagnostic trouble code. See QUICK TEST in TESTS W/CODES - EEC-IV (5.0L) article in the ENGINE PERFORMANCE section. If diagnostic trouble code has not been set, see CIRCUIT TEST DL in TESTS W/CODES - EEC-IV (5.0L) article in the ENGINE PERFORMANCE section for testing.