One other thing you might try... before trying the Marvel Mystery Oil. The seat for
the OS sensor must be dry. So don't apply the oil, or if you have run the engine and
burn it off. Now melt candle wax around the sensor seat. Drip it on. Then heat the
are until the wax melts. Some witll seep into the joint between the threads. It may
be just enough to allow the threads to be lubricated so it will turn.

John Rodgers
"88GL Driver

John Rodgers wrote:

> Todd, get a bottle/can of Marvel Mystery Oil and soak the O2 sensor where it
> screws into the cat or tailpipe. Make sure it is Marvel Mystery Oil and not
> Marvels Top Cylinder Lube. Keep it saturated at the site. Do not run the vehicle
> for 24 hours, just liet it soak. Yo might even have to leave it for 48 hours,
> but if you keep it saturated, it should eventually loosen up.
>
> I have used this stuff to remove exhaust stud nuts off aircraft engines.
> Toughest spot I know for a "stuck" problem.
>
> John Rodgers
> "88GL Driver.
>
> Todd Guttman wrote:
>
> > Does anyone have any suggestions for removing a stubborn Oxygen sensor in an
> > 85 Westy?  The previous owner noted that it is orignal equipment and now
> > quite reluctant to leave its 'home' in the left exhaust pipe after 117k
> > miles.  Liquid Wrench, WD-40 and moderate amounts of 'brutane' have failed
> > me.
> >
> > Any suggestions would be greatly appreciated!
> >
> > Todd
> >
> > 85 Westy, Columbus, OH