What does code P1491 mean on Nissan vehicles?
The vacuum cut bypass valve is not operating correctly, affecting EVAP system control.
OBD-II Code Nissan
P1491 — Nissan — Vacuum Cut Valve Bypass Valve
The vacuum cut bypass valve is not operating correctly, affecting EVAP system control.
Common symptoms
- EVAP system malfunction
Possible causes
- Failed vacuum cut bypass valve
Initial recommendation
Test vacuum cut bypass valve operation and replace 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 Nissan code P1491 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands