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Straight out of the book..."When the thimble is filled with oxygen rich outside air and the outer surface of the thimble is exposed to oxygen-depleted exhaust gas, a chemical reaction in the sensor produces a voltage"
That is not the whole story of how an O2 sensor works, but just one of the things it needs to work properly. Now, if the oxygen rich outside air cannot be seen because the thimble is covered with armor all, clear coat, or anything like that how will the chemical reaction occur?
-Jeremy
From Automotive Electricity and Electronics 3rd edition by Barry Hollembeak
Last edited by jermasaurus; 06-26-2005 at 12:40 PM.
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