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oxygen sensor operation
Ambient oxygen are pumped through the porous platinum eletrode through the zirconia cell and to the exterior platinum eletrode creating a voltage. The oxygen ions can only flow if the exhaust contains hydrogen(h20), carbon monoxide(CO), hydrocarbons(HC) in other words the combustibles not O2.
This is from a book of an Automotive Seminars that I and 30 other techs attended for driveability. That said the down stream O2 with start to flat line if the cat is working. Less combustibles lower voltage.
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