('06-'08) P0457 - Charcoal canister question? - Subaru Forester Owners Forum
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post #1 of 18 (permalink) Old 04-22-2019, 05:01 PM Thread Starter
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P0457 - Charcoal canister question?

Hi!
2008 Subaru Forester 119,000 automatic. Having P0457 code, not gas cap, thinking that maybe a bad Charcoal Canister Solenoid. From examining the canister, there are some clips on diff. parts, does this mean I can replace the drain vent solenoid or do I have to replace the whole box charcoal canister box?
Thanks so much!

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post #2 of 18 (permalink) Old 04-22-2019, 05:42 PM
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I don't have an answer for you, but perhaps you'll find the answer in one of these threads:

P0457 CEL 2004 Forester - SOLVED!
check engine light code P0457
P0457 Code Solution
P0457: Checking purge and vent solenoids

Bobby...

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post #3 of 18 (permalink) Old 04-23-2019, 03:21 PM Thread Starter
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Thank you for the links! I do have to check the filler neck, but what to prepare if it is the Charcoal Canister. One of the links shows someone resolving the issue by replacing his Vapor Canister Vent Valve that he bought on Amazon. It looked like just a separate valve, that I am assuming either removed from the the canister, or is it separate from the "black box" in some Forester years? I guess some years, the valve is built into the Box. Not sure which one I have. If I have to get a whole new one, may need to hit some Junk yards! I will have to get under there again and check the wires to the canister. They looked good, but I will cut back the insulation to check the wires. The former owner had sprayed rubberized undercoating, so the connectors are all covered, but we'll see!
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post #4 of 18 (permalink) Old 04-25-2019, 09:14 AM
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I'm having the same issue with my '07. The dealership diagnosed that the vent valve was not operating and that the entire canister would need to be replaced. In the previous generation foresters this valve was a separate part, but from 2004 on it is part of the canister.
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post #5 of 18 (permalink) Old 04-26-2019, 09:17 AM Thread Starter
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That was what I was afraid of...see that a whole Charcoal canister online is around $300. Weird that my canister has sections that have metal clips on them, like parts could be removed, though I haven't tried it. I posted couple pics I found Online that look similar to mine. Third pic is perhaps the parts removed from the canister?
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post #6 of 18 (permalink) Old 04-26-2019, 07:08 PM
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@Nozaki I pulled the canister on my car today to take a look. I pulled the valve out, which you can see in the attached picture. I think the third picture in your post is from a different generation where the valve and filter box were separate parts.
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post #7 of 18 (permalink) Old 04-28-2019, 09:51 PM Thread Starter
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JacobF thank you for taking the time and going to the effort of pulling your canister. If my canister is bad, would replacing the valve that you pictured removed fix it, or would I have to change the whole thing? On my day off, will really take a good look at the canister and perhaps pull it. Have read that even just small spider webs can cause a blockage in the vent hose. Work as an LNA on an Alzheimer's Unit at a Nursing Home and don't make alot of money. If I have to change the whole thing, wonder how much a junk yard would charge?
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post #8 of 18 (permalink) Old 04-29-2019, 07:14 AM
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@Nozaki Not sure on your car if replacing just the valve would solve your issue, and I can't find anywhere to buy just the valve. I will probably buy a used complete canister and hope that the valve works in it. It seems like they can be found for under $100. This page has a list of all the vehicles that share the same part: https://parts.subaru.com/p/Subaru_20...2035SA000.html
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post #9 of 18 (permalink) Old 04-29-2019, 05:01 PM Thread Starter
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I did see one on Ebay for around $93 with shipping, may have to go that route. Funny I see Youtube vids of kids removing the canister totally, prob. to get some kind of perceived or real performance boost. Not sure how that would affect passing the emissions test here in NH. Thanks again @JacobF
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post #10 of 18 (permalink) Old 05-01-2019, 07:04 AM
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One issue I ran into, which you might as well if you are replacing the whole canister, is I could not get the hose off the rear of the canister. It can be seen in pictures 2-4 in this post: https://www.subaruforester.org/vbull...3/#post3785666

I tried using a screw driver to pry the tabs and squeezing with pliers but I could not get it to come loose. Maybe there is someone around here with some trick to removing this fitting.

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post #11 of 18 (permalink) Old 05-01-2019, 09:59 AM Thread Starter
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Damn spiders!
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post #12 of 18 (permalink) Old 05-02-2019, 02:24 AM
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I’m having the same issue with the same code & nobody can figure it out. I’m going to try the charcoal canister as well.

2007 Forester Sports XT 5spd
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post #13 of 18 (permalink) Old 06-12-2019, 11:24 PM Thread Starter
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Question Charcoal canister question causing P0457

Hi! 2008 Subaru Forester 2.5X Premium, Non-turbo Automatic with 120,000 miles. Past couple months have had P0457 code every 50 miles or so... Changed Gas Cap to new one (non OEM tho) and still get same code. Originally had hard time starting car after fueling, so changed my Purge control valve behind the alternator, that solved the hard-starting post fueling, but still get the code. Fuel filler neck looks good, and no obvious hoses off or cracked. Thinking could be Charcoal Vent Canister, but do not see any cracks or loose hoses. Hooked the green connectors under the dash, and heard several audible solenoids cycling more so from front of vehicle, did not notice a clicking around the Charcoal Canister. Should I hear one from the solenoid? I removed a square cover where I think the valve/solenoid is, but not sure if that is the only one and if that should be cycling on/off. Do I need to buy a whole new canister or can I just get the cylindrical valve that was behind the square endplate? I am enclosing what I Think is the solenoid valve, but not sure. I can't find that particular part Online and did not notice a part number on it. I may end up getting a Smoke Test but wanted to do what little troubleshooting I could do on my own. Have not blown out hoses to Canister or taken the whole thing off to check if flooded. I now am expecting my Lil P0457 to keep popping all the time with its damn annoying "CRUISE" blinker!!
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post #14 of 18 (permalink) Old 06-13-2019, 09:22 AM
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@Nozaki your recent thread has been merged with your existing thread on the same subject.

Please peruse this: Forum Rules - Please read! Specifically this, under the "General Posting Guidelines":
Quote:
4. Do not crosspost, i.e. post the same thread in more than one forum. Choose the most appropriate forum for your topic and post it only once. Duplicate threads or posts will be merged or deleted.
If you're trying to increase the visibility of your thread, you are allowed to "bump up" your thread, once a day.

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'03 X +AVO turbo kit = XT (son's)
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post #15 of 18 (permalink) Old 06-13-2019, 09:31 AM Thread Starter
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My apologizes, was unaware of the "Bump Up" feature, will use this in the future, thanks Bobby!
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