2002 Chevy Impala cigarette lighters, O2 sensor location, h

Hi. I believe I fried my rear seat cig lighter when I left and air compressor plugged in too long. I changed the fuse and still nothing is happening. Also my front one, I changed the fuse, it worked for a little while but now its not working. What can I do. Also I need to replace my hazard switch cause my signals don't work properly, is this hard to do. I also waht to find my O2 sensor so I can check it and maybe replace it, but not sure what I'm looking for. Thanx for your time.