P0440 Evaporative Emissions System

[ericv1984]

I found a list online of possible reasons why that code could be coming up but I forgot what website it was at. So, could anyone please give me a list of possible reasons why the code could be coming up?

I know that the list said something about the gas cap and the fuel filter so I've replaced both.

 

[melsg5]

here is the code and possible causes www.obd-codes.com/p0440

 

[ericv1984]

here is the code and possible causes www.obd-codes.com/p0440

The Catalytic Converter is not on that list but I think mine is clogged so could that be one of the reasons why the code is coming up?

 

[melsg5]

cannt see how a converter issue will show up as an Evap code

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[ericv1984]

cannt see how a converter issue will show up as an Evap code

ok. On that website it says something about checking the sensor, what sensor are they referring too? The o2 sensor? Cause I had a check engine light on for the o2 sensor and then I cleared it and it didn't come back.

 

[ericv1984]

I had an appointment earlier today, after the appointment I got in my car to drive home, looked at the dash and noticed that the check engine light went away. The only thing I did recently was replace the gas cap with a new one, guess that's what was causing it. Was only a 5 dollar fix, which is awesome considering the stupid Hawks Prairie Automotive wanted to charge me 81 dollars JUST to diagnose the check engine light.