[Nozaki]

Hi! New 2008 Subaru owner here, and need some help. 117,000 miles automatic, 2.5 L engine, non-turbo. Keep getting P0457 code. Changed the gas cap, and still get code. Don't see any loose or broken hoses. Other night got P0171 code, but usu. just the P0457. Already changed O2 on it since I got it. Hard time starting after refueling. With these symptoms, thinking it may be one of the Valve Solenoids, believe there is Purge Valve up front and another "drain" valve in the canister underneath near right rear tire. Any ideas would be great, trying to fix it myself before bringing to garage. Thanks!:frown2:

It is a 2008 Forester.

 

[2.5x_sleeper]

@Nozaki I see you're new to the forum, so welcome to the forum from Oregon! :biggrin:

Take a look at this thread: P0457 CEL 2004 Forester - SOLVED!

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Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]

 

[Nozaki]

Thanks for the Welcome! So from quickly looking at the links You listed, the list of possible culprits are rusted filler neck, purge valve solenoids front and back. I am trying to avoid having to bring vehicle in for a smoke test and the associated costs, if it is something I can change myself. I think I read that the Car does it's evap test when car is under 1/2 tank, that explains why it seems like the P0457 code seems to happen when I am under a 1/4 tank.

 

[Nozaki]

I'm hoping that since I don't smell gas near rear of car, and with the symptom of the car hard-starting after fill-up, it is a solenoid valve issue. Not sure, but this sounds like an easier fix than changing a rusty filler pipe. I just don't know which one is the culprit, the one behind the alternator, or in the canister underneath right rear.