Jump to content

Due to a hardware failure on the hosts systems, all posts and messages created between May 26th and Jan 13th have been lost. Additionally, if you joined the NPORA Forums community during that time, you'll need to re-register. -NPORA Mod Team *Updated: 05/19/2022 12:15AM PST

Code Help P1491


Recommended Posts

2003 SE 4x4


I have had code 1491 coming on and off since I have had my pathfinder ( about two weeks.) If I clear it mylsef it comes back after around 30 miles. From previous research it is an EVAP code. seems like a ton of places can trigger this. Where to start? Any advise helps. Recently did a plugs/wires/fuel filter if that is relevant. It also was parked for a few monthes previous to purchase.



Link to comment
Share on other sites

Have you tried replacing your gas cap? When they don't hold enough pressure the computer can throw a code and it's something that can easily be overlooked. A lot of vehicles can do this sort of thing and luckily it's a fairly cheap fix if it is indeed the issue. There's a tester that you can get to test the cap but last I can remember the tester is about the same price as a new cap.

Link to comment
Share on other sites

I'm unfamiliar with newer emissions systems so I'm not of much help but hopefully someone will chime in here soon and help...


Have you checked in the FSM if it's available to see what components are connected in the evap system and where sensors are?


Sent from inside my potato

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Welcome to NPORA Forums


Please register to gain full access to the forum.

Make sure you read the Forum Guidelines and don't forget to post a new intro in the New People Start Here! section, to say hi too everyone.



  • Create New...