Watch out the 87 O2 senor harness doesn't work with anything but an 87 without modifying it,
The 88-93 auto and 5 speed O2 senor harnesses are transmission specific and can't be interchanged without modifying them.
Do you think this is why my car isn't starting? Or is it not that big of a deal?
Yes, if the wires shorted out here, it would cause the car to not start. Also a chance it damaged the ecu.
O2 harnesses are year and trans specific. There a jumper on the harness that if not pinned correctly can short the pin46 trace on the ecu.
Have no clue as to where it came from, I am kind of a pack rat when it comes to fox stuff. I used to work on 60's mustangs and learned about stuff that would be hard to find when cars get old, some stuff just will/can't be reproduced.Do you know if it's an 87 harness?