That code is telling you that there is a fault with the pre cat O2 sensor's internal heater or the wiring circuit (for the o2 sensors heater) from the DME to the sensor. On bank 2
You can test the wiring to the sensor with a volt meter.
Look at the wiring at the sensor side of the wiring connector. If it is a 4 wire sensor (I think it is but not positve) 2 of those wires should be the same color. those are the heater circuit wires.
One is the ground
The other is the positive
If your wiring is ok then the sensor is kaput.
Could be a fault with the DME but that is not very likely
Hybrid Mode
