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99 Expedition Engine Light Code P0455?
I recently purchased a used '99 with 76,000 miles on it. After driving it for 4 or 5 days the "Service Engine" light came on. I had it checked at Autozone today and was told that it is coding P0455. I checked that the gas cap was on correctly. Is there anything else that I can do before I take it to the dealer? The engine is a 5.4L.
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