I decided to start a separate thread on the O2 sensors. I am getting very negative fuel trims. When I scan the voltage on the 02 sensors only go to the mid 600s. This is coupled with minus 21.3 fuel trims. Then all of a sudden the scanner stops working. It freezes all the numbers and the scanning stops.

I looked at the bottom of the car and I see some wires hanging loose on one side. It looks like the wiring to the upstream O2 sensor.


I do not see the connector it self so I do not know if one of the O2 sensors got disconnected.

Would this cause negative fuel trims?

Would it cause a scanner to stop working?

Why no O2 codes? I will look at the engine diagnostics to see if I accidently shut off that code.
I will bring it to my friend who works at the goodyear dealership tomorrow to put on the rack.