William, The O2 sensor kind of acts like a fuel cell(a battery is a good analogy). A voltage is produced (1 to 1.5 volts) when there is a difference of oxygen levels between the inside of the sensor(the environment air) and the outside of the sensor sitting in the exhaust stream . This indicates a rich condition or to little O2.When there is O2 in the exhaust (lean), the inside and outside of the sensor has less O2 differences and the voltage output drops to zero. See: http://neksiwel.20m.com/photo5.html Ken Lewis |
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