P1140 – Intake Valve Timing Control Circuit (Bank 1)
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Symptoms
- Rough idle
- Hesitation
- Poor acceleration
- High fuel trims
- Check engine light
Causes
- Faulty VVT solenoid
- Low oil pressure
- Wiring issue
- Dirty oil
- ECU issue
Diagnosis
- Inspect wiring
- Test VVT solenoid
- Check oil pressure
- Scan live data
- Inspect connectors
Repair
- Replace VVT solenoid
- Refill oil
- Repair wiring
- Fix connectors
- Update ECU