Remove both O2 sensor extensions. The factory harness will reach. You just have to unclip the wiring harness from the back of the engine block and I think at a spot of two on the transmission then the factory connectors will drop down far enough to reach the sensors.
After you've done that then clear the code and drive around for a while. If the light stays off then you're good to go. If it comes back on. Take both of your primary (pre-cat) O2 sensors and swap the sides they are installed on and reconnect them. If the light comes on again read the code and see if it's still telling you it's from bank 1 or if it is now from bank 2.
If the code changes then it's probably sensor. If the code is the same then you might have another issue.