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Q: 5.6.l 4wd.king cab.im baffled at o2 sensor data on 2008 Nissan Titan

Master 77c385ec3dad981443cd9a5b509db22a5a3fa078fc8c154e2bda5f4630ddae75 of Joels Auto Service
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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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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