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heres what I usually do. Go to pep boys and look through the oxygen sensor boxes until you find all the 1-wire oxygen sensors. Buy the cheapest one, usually $12 or $14.
Now, you know exactly which wire is the signal since there is only 1 wire. Install using the single signal wire and never worry about this again. If you put a voltmeter on the wire, it will flip from 0.005Volt - 0.985+Volt when working properly.
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