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Hi Cliff,
I will tell you from my experience, you cannot evaluate a slow or lazy sensor accurately with a digital voltmeter. Even with a very fast sampling meter, with a rapid update rate, you are trying to get high-definition TV from a hotel lobby security camera.
Good for you, to get readings of the heater and an injection system in closed loop. The fact you are consuming fuel at an expected rate and satisfying the current emission testers makes me think you will leave the sensor alone until next time, using those readings as a benchmark.
The heated sensors do indeed last a long time, much more dependent on whether it gets poisoned by improper engine operation or contaminants than mileage alone. But 320K might be a long time to have anything threaded into an exhaust system and come out easily. Still, I say, cross that bridge when you need to.
BTW, my first impression is the hot reading on the heater was a bit lower than I remember; but that is mostly dependent on how quickly you get the meter in place after disconnecting the power source. Doesn't matter anyway-- the fact it works (hot and cold readings different) is evident.
--
Art Benstein near Baltimore
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