Trouble codes › P0137
P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
Oxygen sensors
P0137 means bank 1's rear oxygen sensor is stuck at low voltage, from a failed sensor, wiring or an exhaust leak.
The rear oxygen sensor on bank 1 is staying at low voltage. It may be failed, its wiring shorted to ground, or an exhaust leak may be letting air in near it.
Safe to drive for now. It affects the catalytic converter check and emissions.
Common causes
- A failed rear oxygen sensor
- An exhaust leak near the sensor
- A short to ground in the wiring
- A real lean condition
Symptoms
- Check-engine light
- Emissions monitors may not be ready
What to check first
- Check for exhaust leaks between the converter and the sensor.
- Inspect the wiring under the car.
- Watch the sensor with a scan tool during a snap of the throttle.
- Replace the sensor if it stays low.
What does P0137 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
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Related codes
General guidance for P0137 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.