Here's one for you. Last night I removed our O2 sensor and did a little test.  I brought it inside, connected it to a digital mult-meter and heated it (gently) over an electric stove. At first the meter read 0.00,  within about 15 seconds it started bouncing around between 0.17 and -0.17.  I realize that without an exhaust stream these values are irrelevant.  What was amazing was that I got these readings without the black lead on the meter connected to anything.  The signal wire on the O2 sensor was connected to the red lead. The wire is not coaxial so there is no ground confusion here.  When I touched the black lead of the meter to the O2 body or threads it made no difference in readings. I consistently read an output from the sensor with the black lead of the meter hanging in mid air!  Are these sensors magic or was my stupid test creating static voltage or a "force field" or something? Try it!

Gary

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