I was putting my bumper back on and I noticed what I think was the temperation sensor just hanging off the reinforcement bar..

It's the only plug on the bottom of the reinforcement bar and I had the bumper on already so I was looking under the car on where to plug it into, does anyone know where it belongs/clips to? I couldn't find it..

 

it clips on to the driver side fog grill i believe.

 

You likely broke the bracket on the bumper and the piece it clips into is hanging down too. You should see the little plastic piece on the bumper close to where it's hanging...just super glue it.