mrfeh Posted September 4, 2010 Share Posted September 4, 2010 Hi folks. The check engine light on my 2.5l '99 Outback came on a few days ago. The error code is P0440, which is an emissions problem. What are the common causes of this error? Thanks! Link to comment Share on other sites More sharing options...
1-3-2-4 Posted September 4, 2010 Share Posted September 4, 2010 do you fill up your car with the engine running? Did you make sure the gas cap is tight after filling up? Might want to look here too http://www.ultimatesubaru.org/forum/showthread.php?t=85011 Link to comment Share on other sites More sharing options...
edrach Posted September 4, 2010 Share Posted September 4, 2010 (edited) do you fill up your car with the engine running? Did you make sure the gas cap is tight after filling up? Might want to look here too http://www.ultimatesubaru.org/forum/showthread.php?t=85011 Interesting, that thread was started by the same user. And I thought I had a short memory! However, more information can be had here: http://www.ultimatesubaru.org/forum/showthread.php?t=114669&highlight=P0440 I've been plagued by the same error code, all be it with a different model Subaru, but the hints and tips are similar. I'm still coping with mine but I'll post up when I find the solution to it. Edited September 4, 2010 by edrach Link to comment Share on other sites More sharing options...
1-3-2-4 Posted September 4, 2010 Share Posted September 4, 2010 Wow I jusy noticed that lol what are the odds? I used the related threds feature. Link to comment Share on other sites More sharing options...
edrach Posted September 5, 2010 Share Posted September 5, 2010 What are the common causes of this error? Thanks! Gas cap loose; gas cap defective; leak in any of the hoses and/or fittings around the charcoal cannister or purge solenoid; clogged charcoal cannister; faulty purge solenoid or connector. The error doesn't affect the running of the engine; it's just an annoyance in addition to indicating you're venting gasoline to the atmosphere. Link to comment Share on other sites More sharing options...
subaru360 Posted September 5, 2010 Share Posted September 5, 2010 Filling the tank with it running, gas cap loose or missing, a hose that cracked or fell off, rusted out filler neck. That's what I find most commonly. Link to comment Share on other sites More sharing options...
1-3-2-4 Posted September 5, 2010 Share Posted September 5, 2010 interesting the OP in that other tread from 2008 never followed up and I don't expect the same here... I'm thinking a few things... 1.) habit of filling up with the car running (I heard why people do this.. save time) 2.) bad gas cap 3.) leak in hoses.. 4.) troll? Link to comment Share on other sites More sharing options...
edrach Posted September 5, 2010 Share Posted September 5, 2010 (edited) I keep reading that the code is produced by filling the tank with the motor running produces the code. Read the section on understanding P0440 codes in this endwrench article and I don't see anything that is related to filling the tank with the engine running. Thanks to OB99W for the pdf. http://www.endwrench.com/current/02SpringInsiderInfo.pdf Very specifically, it lists some conditions for generating this code and engine running while filling the tank is not one of them. "The testing of this system is only conducted once per drive cycle and only under very specific conditions: • The fuel tank must contain less than 9.6 gallons of fuel. • The fuel temperature must be less than 113°F. • Engine speed must be over 1500 RPM. • Vehicle speed over 28 MPH. • Throttle position must be mid-range. • Intake manifold vacuum must be equivalent to cruising vacuum. • 455 seconds must have elapsed since engine start." Edited September 5, 2010 by edrach Link to comment Share on other sites More sharing options...
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