2005-2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.

Got a code PO456

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Old Jun 23, 2012 | 09:56 AM
  #1  
spower's Avatar
spower
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Joined: Jun 2011
Posts: 39
From: CA
Default Got a code PO456

This is what it is --> Evaporative Emissions System - Small leak detected

Causes:

A small leak in any of the EVAP hoses or fuel tank hoses
A small leak in the purge valve or vent valve
The EVAP Canister may be leaking
Gas cap not sealing

Does anybody have an online manual or something showing me where the above items are? I don't have a clue how to tackle this issue

I have a 2005 V6 5 speed 80k miles on it.

Thanks!!
Old Jun 23, 2012 | 10:05 AM
  #2  
nightwing0707's Avatar
nightwing0707
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Joined: May 2011
Posts: 85
From: Cali
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have you checked the fuel cap make sure it was on right, and not broken. ive seen people put them on wrong before lol.
Old Jun 23, 2012 | 10:11 AM
  #3  
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spower
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From: CA
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Yeah first thing I checked, it is on fine but I have no idea if it is leaking, is there a way to test it?
Old Jun 26, 2012 | 10:21 AM
  #4  
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spower
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Joined: Jun 2011
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From: CA
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New gas cap fixed it! Whoo hooo!!
Old Jun 26, 2012 | 10:24 AM
  #5  
Nuke's Avatar
Nuke
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Joined: Jun 2007
Posts: 16,182
From: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)
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I was going to mention that 9 times out of 10 it's the gas cap...
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