If you're going to be replacing the sensor, just cut the wires and use
a proper box-end wrench on it. A box-end that has been cut is not
strong enough, in my experience. And as was already suggested, turning
it in a bit before you continue out should help.
Spray some break free or Kroil on it. Then try turning it back in some.
I use a heavy duty flair nut wrench to break them loose. You could make
one by grinding a notch in a box end. It only has to be wide enough to
get the wires through.
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