Quick checklist
Check O2 sensor wiring, test sensor
OBD2 Codes
P0137 – O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
O2 sensor voltage too low
Details
The downstream O2 sensor voltage is abnormally low.
Typical causesFaulty O2 sensor, wiring issue
SymptomsCheck engine light
SeverityMedium
DIY checksCheck O2 sensor wiring, test sensor
ToolsOBD2 scanner
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FAQ
Common questions
What causes P0137?
Faulty O2 sensor, wiring issue
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