2003 Honda Accord AC problem

My car has never posed any problems until recently. I don't know if the 2 are related, but a few months ago, my engine code said the S2 sensor was faulty so I had Honda replace that and they did a 27 point inspection. The light never went out. Honda said that it's another problem that could take hundreds to figure out, that it could be another sensor, etc. So, it was running fine, except for the light so I kept driving it. A few months later, the AC went out, but the fan would still blow hot air. It was diagnosed that the compressor and coils needed to be replaced so I had that done. A day later, one of the hoses popped off, and smoke/steam blew out the front. The mechanic reattached the hose. Then a week later, the AC went out again, and not even the fan will blow now.
Help!