I've always used a 24" stilson wrench (pipe wrench) with a 4' pipe slipped over the handle. 

Karl Wolz
Sent from my electronic umbilicus

> On Oct 2, 2015, at 8:09 AM, Stephen Grisanti <bike2vcu@YAHOO.COM> wrote:
> 
> Harbor Freight sells a flare wrench set that includes a 22mm and that might work with a cheater pipe on it.
> 
> Stephen
> 
> mobile
> 
>> On Oct 2, 2015, at 9:43 AM, Richard Koller <brvkoller@GMAIL.COM> wrote:
>> 
>> 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
>>>