P1340 – EVAP System Incorrect Purge Flow
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Symptoms
- Check engine light
- Slight rough idle
- Emissions failure
Causes
- Faulty purge valve
- Hose routing error
- ECU control issue
Diagnosis
- Command purge valve
- Verify hose routing
- Check fuel trims
Repair
- Replace purge valve
- Correct hose routing
- Update ECU if required