I am having a major problem with my car. There is a black ground wire connected to the coil
For some reason if I have any of the o2 sensors connected that wire becomes a hot wire when the ignition is on; what would cause this to happen? I know it is supposed to be ground but it is hot when I turn the key on.

 

You might get more responses if this was in right forum.

 

oops I did not notice I was in the parts section.