P1257 – Fuel Temperature Too Low
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Symptoms
- Check engine light
- Possible drivability issues
- Incorrect fuel trim
- Emissions readiness delay
- Cold reading in data
Causes
- Faulty temp sensor
- Short to ground
- Wiring issue
- Connector corrosion
- ECU interpretation fault
Diagnosis
- Check sensor resistance
- Measure voltage
- Inspect wiring
- Inspect connector
- Compare to ambient temperature
Repair
- Replace temp sensor
- Repair wiring
- Clean connectors
- Update ECU if needed
- Clear codes and retest