P1204 – Cylinder 4 Fuel Metering Fault
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Symptoms
- Rough idle
- Misfire on cylinder 4
- Poor acceleration
- Increased fuel consumption
- Check engine light
Causes
- Clogged injector
- Leaking injector
- Low fuel pressure
- Wiring issue
- ECU driver fault
Diagnosis
- Check misfire counters
- Inspect injector wiring
- Perform injector balance test
- Measure fuel pressure
- Scan fuel trims
Repair
- Replace injector
- Repair wiring
- Clean fuel system
- Replace fuel filter
- Update ECU software