P1209 – Fuel Pressure Control Fault
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Symptoms
- Hard starting
- Rough idle
- Engine stalling
- Poor acceleration
- Check engine light
Causes
- Weak fuel pump
- Faulty pressure regulator
- Restricted fuel filter
- Leaking injectors
- Fuel pressure sensor fault
Diagnosis
- Measure fuel pressure
- Compare to spec
- Check return and supply lines
- Inspect regulator
- Scan live data
Repair
- Replace fuel pump
- Replace regulator
- Replace fuel filter
- Repair leaks
- Replace pressure sensor