Service theft system

I drove my vehicle the other day and everything was running fine then the following day I tried starting the car and it wouldn't crank at all and my key gets stuck in the ignition. Which I have to push the release button under the steering wheel column. But, everything else are all working fine. The service theft system showed up on my DIC screen. I also scanned it without engine light and my OBDll detected PO160 which is o2 sensor bank 2, position 2 and U0100 is the network issue. I know one problem is the cause/causing everything else to malfunction. I have tried relearning/reprogram the key as I have in the past and I succeeded but now It will not work. In need of help if possible without going the "stealership", thanks.