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!

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

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, 201015 yr by edrach

Wow I jusy noticed that lol what are the odds? I used the related threds feature.

 

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.

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.

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?

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, 201015 yr by edrach