P0156 Heated oxygen sensor circuit (bank 2 sensor 2)

P0156 Heated oxygen sensor circuit (bank 2 sensor 2)

Check Conditions:
3 minutes or more have passed since the starting sequence was completed. Left bank heated oxygen sensor (rear) signal voltage has continued to be 0.15 volt or lower. Engine coolant temperature is higher than 76°C (169°F). Engine speed is higher than 1,200 r/min. Volumetric efficiency is higher than 25 percent. Monitoring time: 7 seconds.
Judgment Criteria
Input voltage supplied to the PCM interface circuit is higher than 4.5 volts when 5 volts is applied to the left bank heated oxygen sensor (rear) output line via a resistor. The PCM monitors for this condition once during the drive cycle.

The most likely causes for this code to be set are:

- Left bank heated oxygen sensor (rear) failed.
- Open circuit in left bank heated oxygen sensor (rear) output line.
- Open circuit in left bank heated oxygen sensor (rear) ground line.
- PCM failed.