P1321 – Fuel Injector Leak Detected (Bank 1)
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Symptoms
- Fuel smell
- Black smoke
- Rough idle
- Poor fuel economy
- Check engine light
Causes
- Leaking injector
- Damaged injector seal
- Cracked fuel rail
- High fuel pressure
Diagnosis
- Check fuel trims
- Inspect injectors
- Perform leak-down test
- Check rail for cracks
Repair
- Replace leaking injector
- Replace seals
- Repair or replace fuel rail