95 truck, V6, automatic
I just swapped in a junkyard engine into my truck. I can't find the O2 sensor pigtail. Somehow it has been misplaced. Where does it come from? The O2 sensor has a 3 terminal pigtail about 6 inches long.
There is NO connector to plug it into. There is a large wiring harness running along the back of the engine, but no plug. Surely, I have the connector behind the starter? Maybe it comes from a long separate pigtail? I know that this sounds crazy, but I can't find it. It MUST come from the large wiring harness that runs along the back of the engine? It is no place to be found. Please help me. Where does it come from? ANY help would be appreciated. Yes; I was HOT tired, dirty and frustrated. I have searched and searched.
Thanks
Mike

 

There are more than one O2 sensors, before the cat, and after

 

Awsome idea! Maybe it is on the same harness and I was looking in the wrong place. I will check tomorrow, thanks.