have helped out my brother inlaw with his BF 2005 falcon

He had a error come up for oxygen sensor at a mechanic via diagnostic plus it did all the symptoms so i purchased one for him

Now he tells me the oxygen sensor has a male plug as it should but he then says to me the plug it goes into is a male plug also i seriously don't know if to believe him ,

i purchased it for him and it clearly is the correct one

I cant go take a look as he is to far from me but i am baffled

Which HEGO is it? BF have 2.

Isn't there also a couple of temp probes in the exhaust around that area as well?