I can't find my secondary O2 sensor!
There is supposed to be one behind the cat, and when scanned by an OBD II scanner, it showed it to be inactive.
I bought a replacement and looked for it, and it appears someone removed it and capped the port where it's supposed to be. What's worse, is the wiring harness is nowhere to be found! Can anyone tell me if some 1996 Sunfire 2.2 sold in Canada were not equipped with them, or is this the result of some shade tree work?

Where does the wiring harness run from? Anyone have a schematic?

Your help is appreciated.
Adam

Got it. Some a$$ hat removed the sensor and unplugged it from the engine connector. The new one has the harness and the whole nine. Looks like I have to remove the plug and install the sensor and plug into the harness. Hopefully I'll pass my etest now.

Adam