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Old 09-17-2012, 09:18 PM   #1
subynube
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Default p0457 evap emissions system leak/gas cap

I have 2002 WRX, fully stock. I have been throwing p0457 code only at highway speeds and at no other time. I visually inspected the hoses behind the power steering pump (not sure what it is called) and they are all connected. I have checked hoses around the charcoal canister and purge valve and all look ok. Haven't had it smoke tested. I have tightened the gas cap. What is the common cause of this, throwing at highway speeds? Thanks
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Old 09-18-2012, 02:37 AM   #2
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Evap Solenoid hoses usually.
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Old 09-18-2012, 08:29 AM   #3
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Originally Posted by Strider327 View Post
Evap Solenoid hoses usually.
Thanks! I have seen those hoses as a cause of failure often on this forum. My car is doing fine with local driving distances, and only throws the code on the highway. Weird.
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Old 09-18-2012, 12:21 PM   #4
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Throw that code yesturday! i was like eff this, 2nd time. i had a crack on my line going to the inlet one, i replaced it with a semi mild rubber one and seems to be holding up so far. Good luck.
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Old 09-18-2012, 03:01 PM   #5
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Quote:
Originally Posted by milocas View Post
Throw that code yesturday! i was like eff this, 2nd time. i had a crack on my line going to the inlet one, i replaced it with a semi mild rubber one and seems to be holding up so far. Good luck.
One of the evap solenoid hoses?
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Old 09-18-2012, 11:49 PM   #6
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Yes, the one that's on the far left of it, I had a crack on the line, and those lines are hard! I got a semi hard one, and it should fix the problem and no worrying about cracking.
Maybe your evap is bad to if your lines is okay. I have a spare, pm me.
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Old 09-19-2012, 02:29 AM   #7
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Yea, I have been battling this for a while. Could be a number of things. Gas cap, fuel pump gasket(Have you changed recently), the evap hoses or solenoid, the t-fitting under the intake manifold in the engine bay.
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Old 09-19-2012, 02:08 PM   #8
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Well, stupid question, but how often is the gas cap the culprit? I am actually going to replace the cap today with a new OEM one. I doubt it will fix it, but it's only 26 bucks so I will try it.
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Old 09-19-2012, 02:53 PM   #9
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Most would say to look at what you last touched. Have you modified or changed anything recently? Either in the engine bay or near the fuel pump? Check the hoses under the car below the gas fill to make sure they are on. Also, under the dash you should have two green connectors you can plug together. When you do, turn the car to the "On" position and the fans should cycle and the CEL will blink. Then get under that canister and see if you can hear it click. I bought a new cap and I have yet to get it again, but no long drives to cause it to go into test yet. I can go months without that stupid CEL coming up!

Long story short: Just change it If it works, it works, if not your out a whopping 26 dollars.
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Old 09-19-2012, 02:58 PM   #10
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Quote:
Originally Posted by BoboTheMonkey View Post
Most would say to look at what you last touched. Have you modified or changed anything recently? Either in the engine bay or near the fuel pump? Check the hoses under the car below the gas fill to make sure they are on. Also, under the dash you should have two green connectors you can plug together. When you do, turn the car to the "On" position and the fans should cycle and the CEL will blink. Then get under that canister and see if you can hear it click. I bought a new cap and I have yet to get it again, but no long drives to cause it to go into test yet. I can go months without that stupid CEL coming up!

Long story short: Just change it If it works, it works, if not your out a whopping 26 dollars.
Thanks for the reply! I have had a lot of under body work done, so It could be the canister vent area that went wrong. Just don't know why I am throwing it at highway speeds and not around town. Ill post back after I change the gas cap!

Where are the green connectors? Under the passenger side dash or the drivers?

Last edited by subynube; 09-19-2012 at 03:11 PM.
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Old 09-19-2012, 03:11 PM   #11
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I happen to know this code fairly well.

Check:

- All hose connections by the canister

- The evap solenoid by the canister. If you remove it and trigger it with 12VDC you can test to see if it is working.

- The blue tee connector behind the power steering pump

- The black adapter behind the power steering pump

That last one got me, until I had my engine in pieces and happened to notice a hairline crack in the adapter. I didn't see anyone mention this one in my earlier searches... It's connected to a hose that comes off the blue tee. My evap solenoid was also corroded and no longer closing.
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Old 09-19-2012, 03:44 PM   #12
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Quote:
Originally Posted by CrashTestRacer View Post
I happen to know this code fairly well.

Check:

- All hose connections by the canister

- The evap solenoid by the canister. If you remove it and trigger it with 12VDC you can test to see if it is working.

- The blue tee connector behind the power steering pump

- The black adapter behind the power steering pump

That last one got me, until I had my engine in pieces and happened to notice a hairline crack in the adapter. I didn't see anyone mention this one in my earlier searches... It's connected to a hose that comes off the blue tee. My evap solenoid was also corroded and no longer closing.
Thank you!! Does that black adapter look like a big black circle, something a little larger than a quarter? And will a 9V battery get the evap solenoid triggered, or do I need 12V? Thanks
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Old 09-19-2012, 07:19 PM   #13
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No. It's barely visible and is just connecting two hoses of slightly different sizes. If you feel around where the hoses leave the blue tee connector you should be able to find it.

Not sure if the 9v would do it.
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Old 09-19-2012, 07:29 PM   #14
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This is from the underside on my bench. The blue tee connector is up and over to the right (that you can't really see in the picture due to a shadow). So it is on the hose that goes down from the blue tee as it sits on your engine.


Last edited by CrashTestRacer; 09-19-2012 at 07:37 PM.
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Old 09-19-2012, 07:52 PM   #15
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Quote:
Originally Posted by CrashTestRacer View Post
This is from the underside on my bench. The blue tee connector is up and over to the right (that you can't really see in the picture due to a shadow). So it is on the hose that goes down from the blue tee as it sits on your engine.

Thank you for this! The hoses, tee connection, and black adapter look absolutely pristine in my car! Seriously. No cracks, tight fit, etc. Gonna shine a light up to the canister tomorrow.

Just got a new gas cap also. OEM. I will post back with results.
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Old 09-19-2012, 09:23 PM   #16
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Quote:
Originally Posted by subynube View Post
Thanks for the reply! I have had a lot of under body work done, so It could be the canister vent area that went wrong. Just don't know why I am throwing it at highway speeds and not around town. Ill post back after I change the gas cap!

Where are the green connectors? Under the passenger side dash or the drivers?
The reason you don't get it around town, is because it requires certain parameters to put it into the test mode that triggers the CEL. One of them being a certain distance driven. You typically drive further on the freeway than around town.

Green connecters are under the steering wheel, left hand side.
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Old 09-19-2012, 09:59 PM   #17
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Quote:
Originally Posted by BoboTheMonkey View Post
The reason you don't get it around town, is because it requires certain parameters to put it into the test mode that triggers the CEL. One of them being a certain distance driven. You typically drive further on the freeway than around town.

Green connecters are under the steering wheel, left hand side.
Yeah, I just found that out also. I think it is the vent valve by the canister. I'll post up when it is fixed. Thanks!
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Old 09-20-2012, 04:56 PM   #18
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I did connect those green wires under the dash, and heard the clicking around the canister. Don't know if this means that the valve is working, or maybe just working part way but still failing. Who knows. I'll just wait and see if the code comes back with my new gas cap. (Although I think when, not 'if')
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Old 09-21-2012, 09:44 AM   #19
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You might be better off having a shop smoke test the the system its an easy way to find a leak, gas caps go bad all the time and are fairly cheap, another check would be putting grease or Vaseline on the gas cap threads and see if that helps
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Old 09-22-2012, 01:42 AM   #20
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Quote:
Originally Posted by subynube View Post
I did connect those green wires under the dash, and heard the clicking around the canister. Don't know if this means that the valve is working, or maybe just working part way but still failing. Who knows. I'll just wait and see if the code comes back with my new gas cap. (Although I think when, not 'if')
If it clicks, it means the solenoid is engaging at least. Could be a stuck valve still.
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Old 09-27-2012, 05:56 PM   #21
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Update: New OEM fuel cap installed, and code came back. Car smoke tested at stealership, and came up with leaks/rust holes in the filler neck of the gas tank. Haven't seen it yet to verify it, but that's what they said. I will update when it is replaced.
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Old 09-27-2012, 08:19 PM   #22
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i know i have this code, when i fill the gas tank comepletely up full ( only have done it once) it over flows onto the ground. i have yet to get this fixed but pretty sure this is what is causing my code. prolly the filler neck or fuel pump gasket.
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Old 09-27-2012, 11:04 PM   #23
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I have a simple "cheat" to fix this problem. Get a tactrix cable, download romraider, turn off the code.

Last edited by Pandasaurus_rex; 09-28-2012 at 05:54 AM.
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Old 10-11-2012, 05:50 PM   #24
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Update again: Fuel filler neck replaced due to porous rotted metal, but no obvious visible leaks. Smoke tested again, no leaks. Code came back. Just gave the car back to the dealership, and they downloaded new software to the ECU. Have not tested the car yet. They even said they are not sure if they got it right this time. Ugh
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Old 11-02-2012, 10:03 AM   #25
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I just got this code, car's idle is a little off too. PITA tracking down the leak w/o smoke.
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