Quick checklist
Check ECT sensor wiring, test sensor
OBD2 Codes
P0118 – ECT Sensor Circuit High Input
ECT sensor reading too high
Details
The ECT sensor is reading abnormally high.
Typical causesFaulty ECT sensor, wiring short
SymptomsCheck engine light, possible overheating
SeverityMedium
DIY checksCheck ECT sensor wiring, test sensor
ToolsOBD2 scanner
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FAQ
Common questions
What causes P0118?
Faulty ECT sensor, wiring short
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