P0157 Heated Oxygen Sensor Circuit Low Voltag (bank 2, sensor 2)
Left Bank Heated Oxygen Sensor (rear) Circuit
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. Volume airflow sensor output frequency is 100 Hz or more. At least 20 seconds have passed since fuel shut off control was canceled. The left bank heated oxygen sensor (front) outputs 0.5 volts or more. After the ignition switch is turned ON, the changes in the output voltage of the left bank heated oxygen sensor (rear) is lower than 0.078 volt. Monitoring time: 10 seconds.
Judgement Criteria
Making the air/fuel ratio 15 percent for 10 seconds richer does not result in raising the left bank heated oxygen sensor (rear) output voltage beyond 0.15 volt.
The PCM monitors for this condition once during the drive cycle.
- Left bank heated oxygen sensor (rear) failed.
- Short circuit in left bank heated oxygen sensor (rear) output line.
- PCM failed.
Left Bank Heated Oxygen Sensor (rear) Circuit
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. Volume airflow sensor output frequency is 100 Hz or more. At least 20 seconds have passed since fuel shut off control was canceled. The left bank heated oxygen sensor (front) outputs 0.5 volts or more. After the ignition switch is turned ON, the changes in the output voltage of the left bank heated oxygen sensor (rear) is lower than 0.078 volt. Monitoring time: 10 seconds.
Judgement Criteria
Making the air/fuel ratio 15 percent for 10 seconds richer does not result in raising the left bank heated oxygen sensor (rear) output voltage beyond 0.15 volt.
The PCM monitors for this condition once during the drive cycle.
- Left bank heated oxygen sensor (rear) failed.
- Short circuit in left bank heated oxygen sensor (rear) output line.
- PCM failed.