Re: O2 snap test - Saab 900 Bulletin Board - Saabnet.com
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Re: O2 snap test
Posted by Bill S. [Email] (more from Bill S.) on Mon, 5 Jun 2006 16:41:52
In Reply to: O2 snap test, Carl, Mon, 5 Jun 2006 14:52:17
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Haven't digested all of your data yet, but I can tell you this: the O2 sensor generates a voltage due to oxygen concentration in the exhaust versus ambient (the backside of the sensor is vented to the outside air). Higher voltages (~1v) mean low oxy concentration in the exhaust (rich). Low voltages (closer to zero) occur when there is less difference between exhaust and ambient, meaning more oxy in exhaust (lean).
BTW, one way O2 sensors fail is when the *outside* gets contaminated, so it doesn't read ambient accurately. This can happen when the power steering reservoir leaks fluid all over the sensor and it cooks on. Ask me how I know!
posted by 130.76.3...
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