Quick checklist
Check O2 sensor wiring, test sensor
OBD2 Codes
P0136 – O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
O2 sensor circuit problem
Details
The downstream O2 sensor circuit is not working correctly.
Typical causesFaulty O2 sensor, wiring issue
SymptomsCheck engine light, possible emissions issues
SeverityMedium
DIY checksCheck O2 sensor wiring, test sensor
ToolsOBD2 scanner
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FAQ
Common questions
What causes P0136?
Faulty O2 sensor, wiring issue
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