Code
P0118
Cooling
Engine coolant temperature sensor circuit high input
The coolant temperature signal reads too high (very cold).
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Most likely causes
- Open sensor circuit
- Faulty sensor
- Bad connector
Symptoms you may notice
- Check engine light
- Hard cold start
- Poor economy
Checks to run
- Measure sensor resistance
- Inspect connector and wiring
Tools you may need
Multimeter
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.