5th Generation Maxima (2000-2003) Learn more about the 5th Generation Maxima, including the VQ30DE-K and VQ35DE engines.

code P1456 very small leak

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Old Apr 29, 2010 | 06:29 PM
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From: deptford, nj
code P1456 very small leak

well more codes can someone put me in the direction of the evap canistor, pics would be nice
Old Apr 29, 2010 | 07:14 PM
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Its a black box behind the drivers-side rear wheel. Disconnect the box (3 bolts) and inspect it for cracks or the ends starting to seperate. If thats the case, silicon is your friend.
Old Apr 29, 2010 | 07:24 PM
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Also check under your fuel cap. If the filler neck opening is all rusty, that will throw the code too. Mine did and I cleaned up the neck with Scotch Brite and the code hasn't come back in almost a year now.
Old Jul 18, 2010 | 04:51 PM
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id hate to bring an old thread back from the dead but i am going through the same code/problem. I did what people said and cleaned the fuel neck with scotch brite. and put the old gas cap back on. And i even tried a new gas cap. But how long is it going to take for the cel to clear itself or do i have to delete/erase it myself get back to me thanks
Jeff H
Old Jul 18, 2010 | 06:26 PM
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any thoughts on what my next step is?
Old Jul 18, 2010 | 11:16 PM
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I did replace the gas cap and i also cleared the code but the ses came back after a week, my next step is to have my shop do a smoke test to find the leak.
Old Jul 19, 2010 | 03:20 PM
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ok just an update i got my gas cap tested and it passed so tomorrow i am getting a smoke test done and hoping that it is a old rotted hose wish me luck guys
Old Aug 23, 2010 | 11:50 AM
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any luck with the smoke test? i got the same prob!
Old Aug 23, 2010 | 03:03 PM
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Originally Posted by blinelaxd27
any luck with the smoke test? i got the same prob!
I havent had time to get to the shop hopefully this month i will be able to go.
Old Oct 20, 2010 | 11:07 AM
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Any update on this? I have the code and plan to inspect it thoroughly before getting the smoke test done.
Old Oct 21, 2010 | 07:07 AM
  #11  
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Sorry nope its not my car its my gfs and she taking her sweet time with this.
Old Oct 21, 2010 | 09:27 AM
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One of the possibilities listed in the FSM is the EVAP canister vent control valve. On the 4th gens, the EVAP canister vent control valve is becomming a problem as the cars age. This valve is by the canister and has a plunger inside it that will stick and not move as it should. You can open up this valve and clean/lubricate it.
Old Oct 21, 2010 | 08:18 PM
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I've gotten this 3 times since owning my max. The first time, I reseated the gas cap and it went away within 30 miles. The second time I replaced the gas cap because the mechanism in the cap that keeps you from overtightening woas slipping and not allowing me to tighten it. I purchased an aftermarket cap from Autozone and had the same problem from the start. I ended up picking one up at nissan, problem has been gone for 3 years.
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