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?
5.6.l 4wd.king cab.im baffled at o2 sensor data on 2008 Nissan Titan
by joelburke26 in New Middletown, OH on July 21, 2013
ANSWER by ziptie12 , 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.