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Code P0455, How to troubleshoot?

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Old 11-24-2003, 12:45 PM
Junior Member
Join Date: Dec 2002
Location: Oviedo, FL
Vehicle: 2000 Ford F150
Posts: 1
Code P0455, How to troubleshoot?

Hi all,

My dad's 2000 F150, 4.6 engine threw the P0455 code. My book says this "Evaporative Emission Control System Leak Detected".

We reset the code once but it came back. We would like to fix it but have no idea where to start.

Any help would be great!

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Old 11-24-2003, 02:03 PM
Senior Member
Join Date: Sep 2000
Location: Mpls, MN
Vehicle: 1997 Ford F-150
Posts: 1,704
It's a fuel system leak code/Evap system not holding pressure.

If you're lucky, it will be a loose fuel cap, the result of fueling while the engine is running, maybe a loose or cracked hose leading from the fuel tank to the filler neck. If you can't find the leak yourself, best bet is to bring it to a Ford dealer. They will run smoke through the system to locate the leak.

This can be a rather difficult one to track down on your own.
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Old 11-24-2003, 02:22 PM
Senior Member
Join Date: Feb 2001
Location: Imperial,Mo.
Vehicle: 1998 Ford F150
Posts: 133
I just fixed that same problem on my 98. Check between the battery and firewall. There is a vacumm line connector with 3 small and 1 large vacumm line. Mine had chaffed against the battery and wore a hole in 2 lines. After repairing the lines and resetting the computer all is well now.
( Mine ) 1998 F150 XLT s/c 4.6l auto ( 248,000+ on the clock and getting tired)
True dual exhaust
Covercraft soft tonneau cover
Deflecta-shield stone guard and wind deflectors
Cooper 265/75/16 ATR
Painted dash

( Hers ) 1998 Explorer XLT 4.0l ohc ( 147,000 on the clock )
4door 4whl drive

Last edited by Lou Colmo; 11-24-2003 at 03:21 PM.
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