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5.6.l 4wd.king cab.im baffled at o2 sensor data

(2008 Nissan Titan)
of Joels Auto Service in New Middletown, OH on July 21, 2013
i hooked my autel up to read pid data on my friends new truck and post cat o2s are reading 2.125 volts.pre cat o2s are switching + and - .5 volts as normal st fuel trim at zero as it should.engine is strong at any rpm,all data looks good.im shocked at the post cat o2s reading a solid 2.125 volts,thoughts?
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Popular Answer
on July 21, 2013
Does the o2 sensor reading fluctuate with throttle change? If the front and rear sensors are reading the same (basically the rears copying the fronts) , then that would be an indication that the converter(s) are not functioning.
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