Spray that sucker with some lightweight oil, such as (at least - WD-40;
better - Liquid Wrench; best - Kroil or some such thing)  Let it set for a
while, then spray again.

Take yourself a Stilson wrench (pipe wrench) and put a bit of pressure on
the sensor.  Start tapping the wrench with a smallish hammer.

Do the "Anvil Chorus" a few times, while spraying (soaking) again a couple
times.  This should break loose all of the rust, sludge, and other crap
that's binding the threads.

If still not free, fit a 2" diameter by 6' long steel pipe (like for chain
link fences) over the end of the wrench, and gently (you have a lot of
mechanical advantage now) increase the pressure on the wrench.

If still no luck, you'll probably need to buy a new pipe - but there's
always the "blue wrench"!

Karl Wolz

>Any suggestions on the removal and replacement of a frozen 02 sender.  I
really do not want to replace the exhaust pipe.