2012 RAM 1500 5.7Hemi engine code P1129 closed loop fueiling not achieved

have a 2012 1500 outdoorsman (similar to tradesman) with the 5.7hemi and I changed out the MAP sensor, Intake air temp sensor, O2 sensors (all OEM parts replacement), was about to do the PCV valve. I do not know what else to do and I'm actually in the military with a American truck...in Italy. Really no available parts, or mechanics to help. So everything I do is via internet ordering (parts), or maintenance on my own. Really would appreciate any guidance as I still get engine codes P1129 (first) then P0135 and P0155 which all tell me closed loop fueling not achieved (probably Air/Fuel mixture to lean but I don't know) and the O2 sensors heating circuitry is off due to the closed loop not achieved. I read in some forums elsewhere about maybe the Engine Coolant Temp sensor and I haven't had any problems although my truck will not get to a temp above 192 for the coolant even when I'm going 50mph. so yeah if you got yours fixed where any of these the case and what may have been the result. thank you for whatever you offer