Check Engine Light code 0456....or please help me from burning my Jeep to the ground - JeepForum.com
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Unread 07-18-2013, 12:37 AM   #1
Polecat
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2006 LJ Wrangler 
 
Join Date: Feb 2007
Location: Holladay, UT
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Angry Check Engine Light code 0456....or please help me from burning my Jeep to the ground

2006 LJ

So I have been trying to track down the source of code 0456 on my Jeep since forever to get it through emissions.

Took it to a shop and did a smoke test, replaced the throttle body gasket and both crankcase breather gaskets and angled plastic tubes on top of the valve cover where they found smoke leaking. Replaced the stupid gas cap. Cleared out the check engine light and drove forever

Emissions still says ODB and O2 sensor not ready.

Check engine light came on after about 300 miles.

I'm about ready to take it to the Stealership and get their diagnosis and hopefully see if it is something that I can repair myself. If it is the O2 sensors is this a pretty easy fix? I'm at the end of my rope here and really don't want to have to throw any more money at this than I have to.

Just wondering if anyone had any ideas or know of a better alternative than than taking it to the dealer.

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Unread 07-18-2013, 10:08 AM   #2
Jeeples
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2000 WJ 
 
Join Date: Jul 2006
Location: forum/f310/, UT
Posts: 4,842
Perhaps this can help:

http://www.obd-codes.com/p0456

May need to find a shop with an OTC Genisys/Pegisys handheld code scanner or Chrysler DRB scanner to test all the solenoids in the system and monitor the pressure readings from the fuel tank pressure sensor/leak detection pump.

On that note, you haven't dropped the tank recently have you?
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Unread 07-18-2013, 10:54 AM   #3
Polecat
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2006 LJ Wrangler 
 
Join Date: Feb 2007
Location: Holladay, UT
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Havent messed with the tank.
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Over the mountains and through the woods, across the stream and up the slickrock, down the canyon and over the rocks to nobody's house I go.
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Unread 07-18-2013, 11:49 PM   #4
lbcrazy
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1988 YJ Wrangler 
 
Join Date: Sep 2012
Location: Clinton, Utah
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Quote:
Originally Posted by Polecat
Havent messed with the tank.
Have you check gas cap? Put Vaseline on the seal of the gas cap and see if that works
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Unread 07-20-2013, 10:26 AM   #5
Tblack
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Murray, UT
Posts: 1,175
Oh man!!! This is the worst code ever to end up with. Its not going to hurt anything... Well, it might hurt Al Gore and Hipsters, but that is a win win. Small leak is even worse because it can pick up on a pin hole sized leak. Did they smoke the fuel system? I believe your jeep has the charcoal canister back by the tank. I would take the cap off and fill the tank with smoke and see if you have any leaks there.
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Unread 07-20-2013, 09:36 PM   #6
Polecat
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2006 LJ Wrangler 
 
Join Date: Feb 2007
Location: Holladay, UT
Posts: 1,993
Broke down and took it to the dealership to get an official diagnosis on it. I need to drop the gas tank and replace some connections and hoses back there. I have the park ordered but I really don't have the mechanical confidence to tackle the project by myself and I am not paying the dealer almost $400 for the job.

Looking around for someone who can help me with the project.
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Over the mountains and through the woods, across the stream and up the slickrock, down the canyon and over the rocks to nobody's house I go.
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