P1117 – ECT Sensor Intermittent
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Symptoms
- Poor fuel economy
- Slow warmup
- Heater not warm
- Check engine light
- Rough idle
Causes
- Faulty temp sensor
- Loose connector
- Wiring issue
- Low coolant
- ECU issue
Diagnosis
- Inspect wiring
- Test sensor resistance
- Check connectors
- Scan live data
- Check coolant level
Repair
- Replace temp sensor
- Fix connectors
- Repair wiring
- Refill coolant
- Update ECU