P1280 – Fuel Rail Pressure Sensor Circuit Low
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Symptoms
- Hard starting
- Loss of power
- Hesitation
- High fuel trims
- Check engine light
Causes
- Faulty sensor
- Low supply voltage
- Wiring issue
- Connector corrosion
- ECU input fault
Diagnosis
- Measure sensor voltage
- Check reference and ground
- Inspect wiring
- Inspect connector
- Scan live data
Repair
- Replace pressure sensor
- Repair wiring
- Clean connectors
- Update ECU if needed
- Clear codes and retest