Nissan Repair Questions? Ask a Mechanic for Answers ASAP
GreetingsCustomerand welcome to JA! I will do my very best to assist you with your problem.
Are there any other codes with this one? Also, do you have any trouble filling the tank?
Ok, the P1456 code is a catch all code for a small evap leak. What we normally see on these is the O ring leaking where the vent control valve is bolted to the charcoal canister. You may actually have to have the evap system smoke tested to determine the area of the leak and then determine if you can do the repair yourself. I can only tell you the most common place that I see this occur. Here is a diagram of the vent control valve in case you want to try and replace it on your own. It does come with a new rubber O ring.
Well, that doesn't match the code, so I figured it would be best to resolve the code and see if that goes away as well. This code is for an evap leak the size of a pin hole.Basically .5mm.
The vent valve should open when the purge valve opens and sucks the vapors out of the canister. If it is not opening all the way,then you might get that sound