Quick checklist
Check O2 sensor wiring, test sensor
OBD2 Codes
P0134 – O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
O2 sensor no activity
Details
The upstream O2 sensor shows no activity.
Typical causesFaulty O2 sensor, wiring issue, disconnected sensor
SymptomsCheck engine light, poor fuel economy
SeverityMedium
DIY checksCheck O2 sensor wiring, test sensor
ToolsOBD2 scanner
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FAQ
Common questions
What causes P0134?
Faulty O2 sensor, wiring issue, disconnected sensor
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