How do you replace an egr valve sensor on a 1998 Ford Expedition?

To replace the EGR valve sensor on a 1998 Ford Expedition, first, disconnect the negative battery terminal to ensure safety. Locate the EGR valve sensor, which is typically mounted on or near the EGR valve itself. Remove the electrical connector and any mounting bolts, then take out the old sensor. Install the new sensor by reversing the process, ensuring all connections are secure, and reconnect the battery.