Quick checklist
Check O2 sensor wiring, test sensor
OBD2 Codes
P0140 – O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
O2 sensor no activity
Details
The downstream O2 sensor shows no activity.
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 P0140?
Faulty O2 sensor, wiring issue
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