Codes on Expedition - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

eddie57 · 12-09-2004, 08:32

My check engine light is on and I had the codes read. The code that was listed is the DTC PO455, EVAP Emission Control System Leak (Large). I had them read at Advance Auto Parts. The guy didn't really know what the problem was. Do you have any suggestions as to what I should do now? Any help is appreciated. It is a 1998 Ford Expedition, Although I am looking at the little paper where the codes are listed and it says Vehicle scanned as a 1999 Expedition. Would that make a difference?
Thanks,
Eddie

LunaticSVT · 01-15-2005, 04:11

Somethings you can check yourself are listen for any audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and even around the fuel tank.

It could be as simple as your fuel cap is leaking. May be a disconnected, loose or cracked Fuel EVAP cannister tube, return tube or purge outlet tube. It can even be your Fuel Tank Pressure sensor going bad.