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Both are very temperature sensitive, and my guess on how the wide-band units work is they're a normal O2 sensor cell with a precision heater and temperature sensor operating in a feedback loop. If you know precisely both the temp and the O2 sensor voltage, you can know the mixture over a much broader range. If you deliberately vary the temperture, too, you can operate the sensor over a wide range of values.
As for needing one, just get ahold of Mueller and put in your share.
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