P1290 – Fuel Rail Temperature Sensor Range/Performance
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Symptoms
- Hot restart issues
- Check engine light
- Incorrect fuel trim
- Emissions readiness delay
- Drivability concerns
Causes
- Faulty sensor
- Fuel overheating
- Wiring resistance
- Connector issues
- ECU interpretation fault
Diagnosis
- Compare sensor reading to actual temperature
- Inspect wiring
- Inspect connector
- Check fuel temperature behavior
- Scan live data
Repair
- Replace temperature sensor
- Repair wiring
- Clean connectors
- Improve heat shielding
- Update ECU software