Nissan P1491: EVAP Vacuum Cut Valve/Bypass Circuit
Is your scanner showing Nissan P1491?
No worries. We'll show you what it means and how to deal with it.
Nissan P1491: EVAP Vacuum Cut Valve/Bypass Circuit
OVERVIEWWhat Does The Nissan P1491 Code Mean?
Engine running at normal operating temperature at cruise speed at low engine load, and then the PCM detected an open or shorted condition in the Vacuum Vent Cut Valve/Bypass Valve circuit.
What Are The Potential Causes Of The Nissan P1491 Code?
- EVAP vacuum cut bypass valve is damaged or has failed
- EVAP vacuum cut valve is damaged or has failed
- EVAP control system pressure sensor damaged or has failed
- Vapor hose between fuel tank and cut valve is blocked or bent
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> 2002-2006 Nissan Altima Vacuum Cut Valve Assembly OEM NEW Genuine
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
ENGINE CONTROL SYSTEM SERVICE MANUAL for P1491 – Pages 582-593.
