Thank you to all who replied about the O2 sensors. I will try to list it. I became a little scared when a repair shop said that "they saw that the harness was going into the firewall." And when I looked it did! But I'm hoping that the sensor somehow disconnects as a plug in. Wish me luck! I'll let you know.

Just one thing: with all of the pictures and info about various topics on the XFires, is there anywhere with pictures of the O2 sensors being changed? Or, pictures of where they plug into harness