P1289 – Fuel Rail Temperature Sensor Circuit
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Symptoms
- Check engine light
- Possible drivability issues
- Incorrect fuel trim
- Emissions readiness delay
- Hot restart issues
Causes
- Faulty sensor
- Wiring issue
- Connector corrosion
- Short or open circuit
- ECU input fault
Diagnosis
- Measure sensor resistance
- Check reference and ground
- Inspect wiring
- Inspect connector
- Scan live data
Repair
- Replace temperature sensor
- Repair wiring
- Clean connectors
- Update ECU if needed
- Clear codes and retest