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If you have an O2 sensor and get armor all on it, you might as well take it out and toss it in the garbage. Once the sensor is covered, it cannot compare the oxygen of the outside air to the exhaust's oxygen content. Used car dealers are notorious for screwing up an O2 sensor from all the armorall or clearcoat they spray under the hoods. Also, when tires are sprayed with stuff like that, sometimes the spray can get the O2 sensor on some setups.
I learned that in my Electronic Diagnosis class a while back. The instructor even demonstrated it for proof.
-Jeremy
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