it is a 02 heater control curcuit bank 1 sensor 1 code. probly caused by the water your talking about if you change sensor and still setting code then it in the harness or the pcm was damaged by water shorting the circuit. one the the wires going to the sensor should have a 5 volt ref and the heater protion should be 12 volts if no voltage keep looking for a blown fuse
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