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Your bank 1 O2 sensor 2 has a heater circuit fault, improper resistance. This is the driver’s side downstream (past the catalytic converter) sensor. That does not mean the sensor is bad. First, check all wiring. Melted/damaged wires (and connectors!) have caused many perfectly good sensors to be replaced unnecessarily. If the wiring is good, the sensor may still be functioning ok, but the heater has gone bad. The O2 sensor needs to be about 600 degrees before it works right, so the heater helps the O2 sensor work before the exhaust system has fully warmed up.
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