Washed the Jeep yesterday and saw this wire hanging out. It connects in a T shape above the transfer case. Not sure what it is, but since it came undone, I've been having response problems and a check engine light. Thanks.

 

Looks like it's for the rear o2 sensor

 

x2. Looks the the wire got cut right by connector. Check the o2 sensor in you cataylic converter and trace the wire back from it.

 

get a flashlight...the radius it stretches can't be too big.

 

Would that have anything to do with my response problems?

 

Yea.. A bad O2 can do all kinds of wacky things and turn that light on in your dash.