P0137 on Chevrolet
O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
P0137 on Chevrolet vehicles indicates o2 sensor circuit low voltage (bank 1, sensor 2). Au7o has documented this code across 1 Chevrolet model — most commonly on Sonic. 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. Typical repair costs on Chevrolet range from $50 to $500, depending on the specific model and root cause.
Common Causes of P0137
- •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)
P0137 on Chevrolet by Model
Chevrolet Sonic(1 issue)
- Persistent Check Engine Light and Electrical System Faults2012-2016
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.
Looking for P0137 on a different make?
View P0137 across all makes →Frequently Asked Questions
What does P0137 mean on Chevrolet?▼
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. On Chevrolet specifically, this code is documented across 1 model.
What causes P0137 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0137 on a Chevrolet?▼
Repair costs on Chevrolet range from $50 to $500, depending on the specific model and root cause.
Which Chevrolet models have P0137 documented?▼
Au7o has documented P0137 on 1 Chevrolet model: Sonic.