P0137 O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
What does P0137 mean?
P0137 — O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) (bank 1). This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects o2 sensor circuit low voltage (bank 1, sensor 2) on bank 1. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0137
- Exhaust leak before the downstream sensor
- Failed downstream oxygen sensor
- Open or shorted sensor wiring
- Controller ground issue
How to fix P0137
- Check for exhaust leaks and verify the sensor's ground
- Watch for a reading pinned near 0v at steady throttle
- Test the signal circuit continuity
- Replace the sensor if it reads low with a known-good exhaust seal
- Clear the code and verify the catalyst monitor resets