AFR stuck at 14.85 - HELP

[Witness]

Originally Posted by C-love This leads me to believe you may have a fault in the connectors/wiring for the 02 sensor. I know some people have had issues with the aftermarket O2's, but is it usually a dead reading like you are seeing with static AFR? Probably need to figure out what pins the O2 sensor(s) use on the ECM connectors and test the wiring from the ECM to the O2 connector. If there is a fault there and wiggle tests don't show the issue you may need systematically trace that circuit between the two until you find the fault (assuming you find one on the first place). Possibly a wiring harness rubbed through on an engine component. I might start looking near hose clamps next to the ECM harnesses as this seems like a common failure point.

I found an ECU pinout on the forum. I'll take a look after work to devise a way to check the harness. Possibly using a volt meter to check continuity (?). Only thing is that more than one pin is used for the front O2 sensor but I should have a better understanding once I have it in front of me.