It basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).
Bank 2 is the right side as you look at the egine from the front of the car.
Causes
A code P0161 may mean that one or more of the following has happened:
Possible Solutions
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