How to identify O2 sensor wires? How to tap them? How to read them?
I'd like to tap an O2 sensor's wires and hopefully use a DMM to get a relative idea of A/F ratio while driving. I'm pretty sure mine are narrowband.
The normally sensible engineers at GM decided that my pre- and post-cat O2 sensors should have the same color wires and be in the same bundles. Besides physically tracing the wires or using a tone generator & probe, how do I tell them apart?
Once I find them, I assume I can just carefully tap them with a scotch-lok quick splice. I won't need to cut and interrupt them to put my meter in series, right? I don't want to interfere by measuring...
Once I have my DMM hooked up, I'm pretty sure I'll have to look at voltage. Would a higher reading mean richer or leaner? A little googling makes me think that higher voltage means richer ratio.
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theholycow 
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