You are just going to have to look around the engine compartment in the general area of that sensor for a like connector. It will more then likely be a white connector and have four wires, four pins, the connector its self will be sort of round in shape and have three squared, raised spots so that the 02 sensor can only go into it one way.
I don't know what to tell you guy. If its missing then its been removed from the harness, but I highly doubt it has. Trace every thing from the harness following the wire loom by hand until you find it.
I cant help you help me, help you.
Thats redonkulous. Either you know what you are looking at or for or don't.
In which case you need to limp it to a shop and ask, or ask a ford dealer mechanic.
They are always more than willing to give you part locations and such for free.