Missin o2 sensor connector

[WillC]

I just recently replaced my 2v in my mustang and when I got to plugging in the upstream o2 sensors I realized I only have one connector for them on my engine harness. My previous harness had them on the battery/starter harness and I sold it with my old engine. What is a fix for this?
Can I wire in a connector using the wires for the downstream o2 sensors since I don’t have catalytic convertors?

 

[Mustang5L5]

No. Downstream O2s have different functions. Would require rewiring/repinning the harness/ECU connector to send the signals from that connector to the correct ECU pin.

You’ll need to get a harness with proper connections for the two upstream o2s