Alright, so I started to get codes for my passenger upstream sensor and my driver down stream sensor. I just replaced my driver down stream sensor and when I checked to see if the code would go off. Initially it did, but then I took it for a test run. When I ran a diagnostics on it, everything lit up like a Christmas tree. I have never seen this many codes and Have no idea what is going on. The fallowing codes are sensor related: P1065, P1031, P1051, P0037, P0057, P1564. In addition to these codes I also got P1564, B1049, B1054, B1019, C1179, and C1143. I have no idea what is going on. I am looking for help here. I am a full time student with two kids so I don't have a ton of time to fish around. So attempting to do this on my own has been a real pain and has been distracting me from finish school. Any help is wanted and would be greatly appreciated. Is there something that would cause all four sensors to go off at once? Where can I look? What can I do? I have an 04 Pathfinder Armada. Thank you very much for your time and help.