Nissan Error Code P1491: How to Fix It

Q: Can I drive with P1491 error code?

Yes, you can typically drive safely with P1491, but it should be addressed soon as it affects emissions compliance and may impact fuel economy. The vehicle will usually still pass basic safety inspections.

Q: How much does it cost to fix P1491 on a Nissan?

DIY repair costs $50-150 for a replacement vacuum cut valve, while professional repair typically ranges from $200-400 including labor and diagnosis time.

Q: What causes Nissan P1491 error code?

P1491 is usually caused by a faulty EVAP vacuum cut valve bypass valve, damaged vacuum lines, poor electrical connections, or rarely, ECU programming issues.

Q: Will P1491 cause my Nissan to fail emissions testing?

Yes, P1491 will likely cause your vehicle to fail emissions or inspection tests since it relates to the EVAP system which controls harmful vapor emissions.

Abstract

The P1491 error code on your Nissan indicates a problem with the EVAP vacuum cut valve bypass valve, which is part of your vehicle's emissions control system. This valve helps control fuel vapor flow and when it malfunctions, it can cause the check engine light to illuminate and may affect fuel economy.