Replacing O2 Sensor

[kosteniuks17]

Hey I recently got a P0031 check enginde code which refers to overheating in bank 1 sensor 1. So I wasnt sure exactly which oxygen sensor this was, is this the one right on the front or underneath the car? Also I was trying to unplug the oxygen sensor and the actual electrical plug is so hard to detach from the old sensor. Is there something im suppposed to do with the plug to make it detach from the other connection?

thanks,

 

[HKPRO5]

yea there is a little part where you depress to unlock the clip, hold that down and pull away.

The Band1 Sensor1 is the first o2 sensor on the top. Closest to the valve cover.