O2 sensor http://www.autozone.com/engine-management/oxygen-sensor/ntk-oxygen-sensor/408551_828034_0_98000
OEM O2 Sensor socket http://www.autozone.com/loan-a-tools/oxygen-sensor-socket/oem-oxygen-sensor-socket-set/272729_0_0
Disclaimer: I’m not a mechanic! Proceed with working on your vehicle at your own risk.
With that said, i work on computers for a living. If i can do it, chances are you can too!
I couldnt find any articles/videos out there for changing the downstream O2 sensor on my 2007 Hyundai santa Fe. Error code was P0420.
Overall, it took me 2 hours total. The first hour was just making sure which part i was replacing and establishing a plan of action. The second hour was going to autozone and getting the socket set, removing and replacing the O2 sensor. I hope this video helps you decide whether or not you want to try this repair or take it to a mechanic.