P1265 – Fuel Quantity Adjuster Range/Performance
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Symptoms
- Rough idle
- Hesitation
- Loss of power
- Surging
- Check engine light
Causes
- Sticking adjuster
- Contaminated fuel
- Low fuel pressure
- Wiring resistance
- Control module issue
Diagnosis
- Check commanded vs actual quantity
- Inspect fuel quality
- Measure fuel pressure
- Check wiring resistance
- Scan live data
Repair
- Replace quantity adjuster
- Clean fuel system
- Replace fuel filter
- Repair wiring
- Update ECU software