Dennis,
I had this same problem and I heated the cat at the junction where the O2
sensor screws in with MAPP gas. Then quickly slipped my 22mm box end over
the disconnected sensor wires and was able to break it free. It would be
better as others have said to use the dedicated O2 sensor socket. Heat was
essential however in my case.
Good luck.
Rick Koller

On Thu, Oct 1, 2015 at 12:37 PM, Dennis Jowell <dennisjowell@gmail.com>
wrote:

> I just started to replace my O2 sensor on my 2.2 wbx. No,luck using my
> wrenches . Everything is rusted together. The catalytic converter is only
> about a year old. Is there a better way to remove the sensor? Should I use
> my touch to heat the sensor ? Any ideas would be great. I might get to
> Quebec yet just have to get this done.
>
> Regards,
> Dennis
>
> Dennis Jowell
> Scotch Hollow Farm
> Newbury, Vermont
>