Originally Posted by
steveo
i'd say they should be oscillating from a lean range of 0-400mv and a rich range of 600-1000+ mv.
somewhere in that 400-600mv range is where stoich is
millivolts are really small. you can probably get a couple millivolts of voltage by holding your multimeter probes to your finger.
it's more the rate of switching you should be concerned with. what's worrysome is if it's 'hanging' at low voltage then 'hanging' at high voltage (switching slowly) which either means your o2 parameters are screwed or your sensor is dying. or worse, its just stuck at high or low voltage which means your ECM isn't correcting for some reason
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