What does code P1491 mean on Infiniti vehicles?
The ECU detects a malfunction in the vacuum cut valve bypass valve itself.
OBD-II Code Infiniti
P1491 — Infiniti — Vacuum Cut Valve Bypass Valve Malfunction
The ECU detects a malfunction in the vacuum cut valve bypass valve itself.
Common symptoms
- Check engine light on
Possible causes
- Faulty vacuum cut bypass valve
Initial recommendation
Inspect and replace the vacuum cut valve bypass if necessary.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Infiniti code P1491 with your vehicle's actual symptoms for more complete diagnostic guidance.
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