My wife has a 2003 Ford Expedition with a 4.6L engine. It is throwing a code of J0128 for a Coolant Thermostat Sensor. I have already ordered it from O'Reilly's. Can someone send me a picture of where it is located? Thanks in advance.

 

There are no "J" codes, and P0128 is Coolant Thermostat Malfunction, which means the PCM doesn't think the engine warmed up fast enough. It's usually set due to low coolant, so check that first. There is no thermostat sensor. It uses the ECT (Engine Coolant Temperature sensor) &/or CHT (Cylinder Head Temperature sensor) to make that determination, based on running time & their startup values.