O2 sensor wiring?

Hello, I assume you are referring to the heater circuit for the B1S1? Its the grey wire at the harness sensor plug.

This grey wire is the power feed for the oxygen sensor heaters, and the 2nd diagram shows where the power originates from, but you would be missing power for a bunch of other actuators as you can see if it was a fuse issue. So it sounds like there is a break in the Grey wire somewhere in between the sensor and the smart junction box behind the passenger side kick panel.