Welcome back to 2CarPros. That cannot be the actual fuel trim number. I would say whatever you are using to read the data is either reading the wrong signal or it is reading it inverted. Normal short term fuel trims on a good running engine will be around 1%. It also wouldn't be expressed as Bank 1 Sensor 2, but only as bank one or bank two.
B1S2 would be a designation for an oxygen sensor, but they don't read in percentage but in voltage.
What is the scan tool you are using?
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Wednesday, October 23rd, 2019 AT 7:25 AM