Here again in my slow but steady (and somewhat long winded) quest for emissions nirvana.

I used a digital voltmeter to test O2 sensor function, hot idle, meter between sensor wire and negative battery post. I did read the informative thread a few days back, plus an article linked in the FAQ about using an oscilloscope to get a true picture of sensor performance, but I don't have one of those at home. Let's say for a moment that the flashing numbers on my voltmeter ranged from 45 to 75 millivolts and only touched 125 once in a two minute period. Without the extra detail, is it safe to say this thing is shot? Mr. Haynes tells me that 45 is the threshold for popping a code.

If the sensor is shot, and I order a new one, I'll have a few days to wait. Would I get better performance if I unplugged the harness from the old sensor and let the ECU run in default mode for those few days?

Maybe I should also order a Bentley while I wait.

Thanks all.
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Jim - '92 Red 245 191K, and sometimes an '85 245 275K