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Hello, the other day my check engine light came on, read code P0440 Evap Emission control malfunction. I had the light turned off but it came back on today, I am assuming its the same code (will read the code tomorrow for sure). Now I did a little research on this and understand that it could be the gas cap, Purge solenoid, purge valve or plugged system. Which system is the best one to go after first? Ie how do I test the purge solenoid or purge valve? I am a student at a tech school so I am trying to diagnose this myself to save money but do not want to go changing parts at random. Any help would be appreciated. Thanks.
 

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No substitute for cubic inches
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Have you left the car running while gassing up? If so that will cause the light to come on. These systems are very pressure sensitive, gassing up while car is running or wrong, or missing gas cap are the most common causes for this code.
 

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nope, did not leave running while fueling, cap has to be right its the factory cap, (car has 51k miles on it). I appreciate the help though.
 
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