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Old 10-12-2006, 10:47 PM
Junior Member
Join Date: Jul 2006
Location: Coinjock,NC
Vehicle: 2004 ford f150
Posts: 3
Check engine light-Codes PO455and PO457?

I have a 2004 XLT X-Cab 5.4 4x2 . The check fuel cap message kept coming up and then ceck engine light came on . Autozone checked and cleared light ,said to make cap click several times for a good seal. Message came back on so I bought a new cap from Ford and had AZ clear it again. After about 3 weeks the check engine light came back on with codes of PO 455 and PO 457. The Autozone clerk said that the first code(PO 455) showed a large emission leak and the other(PO 457) was the fuel cap. The truck runs great with good gas mileage ;what is the cause of the codes and how do I correct them?
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Old 10-12-2006, 11:28 PM
Senior Member
Join Date: Oct 2002
Location: St. Louis (Out in the woods)
Vehicle: 2001 Ford F250 6.8
Posts: 5,221
Check the fuel filler neck for any damage.

Observe whether your fuel gauge is indicating properly.

If nothing relevent is observed, take it to a good independent shop or a dealership that has a smoke machine and a technician who knows how to use it.

If your original owner's manual is missing, download a soft copy from www.fleet.ford.com under the MAINTENANCE tab.

1995 Mustang GT Convertible, only 68K miles.
200 Ford Contour Daily drive.
2001 F250 SD, 6.8L, 4 X4.
2007 Mercury Mariner AWD - Wifey's daily driver
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Old 10-15-2006, 07:35 PM
Join Date: Dec 1999
Location: CA
Posts: 59
I had a similar problem. Turned out to be a cracked charcoal canister (after two new gas caps).
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Old 10-15-2006, 07:35 PM


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