P0137 on 2012-2016 Chevrolet Sonic — O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
1 vehicles · 1 makes · $50-$500 repair
How to diagnose and fix P0137: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Chevrolet Sonic · 2012–2016
Early Chevrolet Sonic models are prone to persistent check engine light illumination with various electrical system faults. The 2012 model year in particular has a reputation for the check engine light activating with no clear mechanical cause. Issues range from faulty oxygen sensors and MAP sensors to ECM communication errors. The vehicle has been recalled 7 times for the 2012 model year alone across electrical and safety systems.
Common Symptoms
- Check engine light illuminated with no drivability symptoms
- Multiple warning lights on dashboard simultaneously
- Intermittent electrical accessory failures
- Battery drain when parked overnight
- Instrument cluster display glitches or flickering
How to Fix
Have the specific DTC codes read with a proper scan tool (not just a basic code reader). Common causes include loose gas cap, failing O2 sensors, and MAP sensor failures. Always check for TSBs matching your specific code combination. A factory-level scan tool at the dealer can detect module communication errors that basic scanners miss.
Sources for this issue (1)
Find P0137 by make
Browse every documented model and issue for your make.
P0137 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
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.