oh, yes well then the socket will not fit on the connector, an open ended wrench rounds the head of the o2. You need a special socket for o2 that has a split cut into the metal to let your o2 wires go through, if not it is possible to take a small pick and find the release clips inside the connector and pull pins out. This is time consuming and sometimes impossible.

 

This is true.

94whtgsr:
The o2 sensor is not something you want to mess up, especially since inexpensive o2 sensors are hard to find...