My brother shared this trick with me for removing o2 sensors:

1)  Get the pipe and sensor hot (engine running for a couple of minutes if still on, propane torch if off vehicle)
2)  Apply parafin (candle wax) at the threads/junction of the pipe & sensor - wait a minute or so for melting and thread penetration
3) Apply your favorite torque method while still hot

This is the method he uses to remove (literally) hundreds of o2 sensors - he works in the Dyno Lab at the Daimler-Chrysler Tech Center.

         -- Evan

> Shawn Luft wrote:
>
> >Hi
> >
> >I know this has been discussed before, but the oxygen sensor is a
real bugger to
> get off !!
> >
> >I'm about to give up :(
> >
>
>
> --
> Gary McEachern
> Reading, Ma
> '90 Westy Subavanagon
> '87 Wolfy Subavanagon
>
>
> __________________________________________________________________