P0137 on 2012-2016 Chevrolet Sonic — O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
1 vehicles · 1 makes · $50-$500 repair
Most Reported On
P0137 is an OBD-II diagnostic trouble code meaning “O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2).” This code means the downstream oxygen sensor on bank 1, sensor 2 — the O2 sensor located after the catalytic converter on the engine side containing cylinder 1 — is reporting a steadily low voltage. A low signal generally corresponds to a lean exhaust reading, and the computer flags it when the voltage stays below the expected range, indicating the sensor sees more oxygen than it should or isn't responding correctly. Because this rear sensor primarily monitors catalytic converter efficiency, the cause is usually the sensor or its circuit, though an exhaust leak that lets outside air in can mimic a lean condition. It generally indicates a downstream sensor, wiring, or exhaust-leak issue rather than a major engine problem. This code is most commonly reported on 2012-2016 Chevrolet Sonic, with repair costs ranging from $50 to $500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0137, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
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A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
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Autel MaxiCOM MK808S Diagnostic Tool
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Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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FAQ
What does P0137 mean?
P0137 stands for "O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)." This code means the downstream oxygen sensor on bank 1, sensor 2 — the O2 sensor located after the catalytic converter on the engine side containing cylinder 1 — is reporting a steadily low voltage. A low signal generally corresponds to a lean exhaust reading, and the computer flags it when the voltage stays below the expected range, indicating the sensor sees more oxygen than it should or isn't responding correctly. Because this rear sensor primarily monitors catalytic converter efficiency, the cause is usually the sensor or its circuit, though an exhaust leak that lets outside air in can mimic a lean condition. It generally indicates a downstream sensor, wiring, or exhaust-leak issue rather than a major engine problem.
What are the most common causes of P0137?
The most common causes of P0137 are: Failed or aged downstream oxygen sensor, Exhaust leak ahead of or near the rear sensor (drawing in air), Damaged O2 sensor wiring or connector, Open or high resistance in the signal or heater circuit, Corroded or loose sensor connector, Contaminated sensor (oil, coolant, silicone), Genuine lean running condition affecting exhaust, Faulty engine control module (rare). The specific cause varies by vehicle.
How much does it cost to fix P0137?
Repair costs for P0137 range from $50 to $500, depending on the vehicle and root cause.
Which vehicles are affected by P0137?
Au7o has documented P0137 across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.