My wife's Fusion would very occasionally throw an EVAP code for the purge valve but every time I tested it it seemed to work fine and the code would go away. It did this for about a year and a half until it finally started to just die when she came to a stop. $120 for the part and 15 minutes for the install and its been fine since.To update, Ford could not replicate the code and all systems passed, so I guess for now I am good!