spark plug thread is 14mm diameter.
02 sensor is bigger ..might be 18 mm dia.

On 10/2/2015 4:16 AM, Richard Koller wrote:
> Dennis,
> I forgot to mention that I had to restore the threads in the O2 bung with a
> thread chaser ( if my memory holds, I used a spark plug thread chaser )
> after removing the sensor. I've done this a couple times and it has worked
> out each time and I was able to reuse the O2 sensor with no problem.
> Rick
>
> On Fri, 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
>>>
>>