What is the location of o2 sensors upstream and downstream

If you want to can replace them all but not needed. The code should tell you sensor 1 or sensor 2 and which bank. Sensor one is upstream and before the CAT and sensor, 2 is after the CAT. Alex

Seems kinda early for O2 sensor failure .. HIGHLY RECOMMEND testing for a blown fuse ! Here is a handy link: https://www.autogenius.info/hyundai-santa-fe-2013-2014-fuse-box-diagram/ The O2 sensor circuits are FUSED..