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My wife’s 2010 Nissan Versa popped a 456 error code – small evaporative emissions leak. The first thing I did was replace the gas cap with an OEM cap, clear codes, and see what happens. Sure enough, within two weeks, the code popped back up. However, the Check Engine light disappeared a couple times over the next few weeks, but always came back, always with the 456 code.
I took it into the dealer for a smoke test, since the car is still under some warranty and figured any repair might still be covered. However, they just called and said they found no leaks, and that the code was an old code, not a current one.
What’s my next step? It sounds to me like t’s an intermittent problem with one of the sensors or other electrical components — I doubt the dealer took the time to check every electrical connection in the evap system for a true diagnosis.
As it stands, I plan to drive it as normal until the light comes back, and then (if at all possible) immediately bring it back to the dealer for a non-leak diagnosis.
Any advice on what could be going on?
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Was the fuel pump ever replaced or removed? If the seal or line was pinched or not
put on right this will cause the code. Otherwise wait for the code to come back and
have it fixed under warranty.The Fuel pump has not been removed or replaced that I’m aware of.
We did buy it Certified Pre-Owned at 12,000 miles, so unless it was replaced in that first year, it should still be the original part.
Next time the code comes on, shall I ask (demand?) they check the fuel lines as a potential cause of the 456?
[quote=”shidara” post=158612]The Fuel pump has not been removed or replaced that I’m aware of.
We did buy it Certified Pre-Owned at 12,000 miles, so unless it was replaced in that first year, it should still be the original part.
Next time the code comes on, shall I ask (demand?) they check the fuel lines as a potential cause of the 456?[/quote]
It couldn’t hurt. Its hard to find an intermittent problem sometimes. Frustrating for the customer and the tech.
Unfortunately I’ve been experiencing the exact same issue with my 2002 Nissan.
I’ve smoked the system and found no leaks.
Checked and replaced any lines that even remotely looked as if they might cause any issue.
They are times it won’t show up for months, then there are time it shows up at the exact same time and place 2 or 3 times (When I turn off the main road on to the side street)
I beginning to believe that during those times while turning, something may be flexing….
I did apply some silicone paste to the ring gasket of the gas cap..
That apparently helped for a few months.
But being it happens intermittently it’s a tough one to pin down.Intermittent EVAP problems are the worst. Often I end up finding a solenoid is the issue in those cases. Something that won’t show up with a leak test unless you’re looking for it. In the case of the Nissan, I’d be looking at the canister vent solenoid behind the drivers rear wheel. In fact, the Nissan I worked on for the FiF series had that exact issue. I was able to verify that it had power and ground, but the solenoid wasn’t working.
You have a much newer vehicle. I’m not sure if the same would apply. Honestly if the code hasn’t come back, you may not have anything to worry about. Besides, the EVAP system is not critical to the operation of the vehicle. It’s just there to help control fuel vapors within the system.
Please keep us updated on your progress.
This is pretty unlikely given the age of the car but maybe crawl under it where the gas filler neck is and see if there is excessive rust or any apparent damage to the neck or rubber hose connecting the neck to the tank.
I had some 97 acura CL that i think had the same code (or something real similar, EVAP related) come up time to time but in my case, that small vent hose next to the filler neck was leaking. It was leaking bad enough to cause puddles of gas if I overfilled the tank but it took a while before the CEL came on.If your car was NOT under any kind of warranty, i guarantee they would find the problem. Maybe take it to a shop to be inspected but make NO mention of warranties. It may cost a buck or two for the diagnosis but at least you will get a solid answer.
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