on my 2003 dakota 3.9L

My PCM Could not read alll the sensors/relays from an OBD II scan mode Ie. 02 sensors b1 and B2 failed, Catalys - Fail, Evap - Failed, EGR - na - a/c system - Fail

But From OEM scan mode All was readable why is this? and my ECU:Engine calibration id is: 56028718AA Verification Id is:: ABF1882B This Does Not make sense. is it sn AB flash or AA????