the oxygen sensor generates its own voltage but it is NOT 12 volts. you will only measure 12 volts if you are measuring a heated oxygen sensor and measuring the heating coil power circuit. the voltage reading on a thimble type oxygen sensor should bounce between .1 volts and 1 volt. the more it crosses across the .45 volt "middle" the better it is working. jonathan On Wed, 12 Apr 2006, Richard A Jones wrote: >> the oxygen sensor generates it >> own voltage and uses the exhaust for its ground. > > So one-wire is 12V, and 3 wire has wire 2,3 for the > heater. Again, see Ken Lewis's site for great info: > http://neksiwel.20m.com/photo5.html > > Richard A Jones > Boulder, Colorado > > > |
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