Exhaust Pressure (EP) Sensor
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The EP sensor measures the exhaust pressure downstream of the EGR cooler. The EP sensor signal is used primarily for EGR cooler effectiveness.
The EP sensor is located between the EGR cooler and the EGR valve on the EGR orifice tube assembly.