Question

The filler cap light on, check engine light on, engine hard to start unless you wait a few seconds with key on my 2003 Ford F150 4.2L. I have the engine code P0455

Answer 1

Hi there

This code is for a large evap leak. If the gas cap is tight then usually you will need to have a smoke test done to locate the source of the leak. A common issue is a vent control valve failure. If it' stuck open that creates the leak.

Answer 2

P0455 FORD - Evaporative Emission Control System Leak Detected Gross Leak

Read more: https://www.autocodes.com/p0455_ford.html