P1221 – Fuel Metering Solenoid Range/Performance
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Symptoms
- Rough idle
- Hesitation
- Poor acceleration
- Surging
- Check engine light
Causes
- Sticking solenoid
- Contaminated fuel
- Low fuel pressure
- ECU control issue
- Wiring resistance
Diagnosis
- Check commanded vs actual pressure
- Scope solenoid control
- Inspect fuel quality
- Measure fuel pressure
- Scan live data
Repair
- Replace metering solenoid
- Clean fuel system
- Replace fuel filter
- Repair wiring
- Update ECU software