idontknow Posted January 24, 2009 Share Posted January 24, 2009 I am continually getting a P0457 code (loose gas cap or gas cap is off). I can also smell gas outside the rear of the car when I stop. No signs of gas leaking around the fuel lines, and I've checked and there is no gas smell at the gas cap (I thought the gas cap wasn't sealing and killing the vacuum on the tank). Any ideas? Link to comment Share on other sites More sharing options...
Opie Posted January 24, 2009 Share Posted January 24, 2009 PO457 is an EVAP system leak...not necessarily just the gas cap. Get the car smoke tested at a dealer ASAP Link to comment Share on other sites More sharing options...
blackfang Posted January 24, 2009 Share Posted January 24, 2009 Yep it normally is a small evap leak and like Opie said, the best thing to do is have them smoke test it to see if there is a leak in some of the hoses. 2 months ago we had an outback that had some of the hoses chewed up by the local rodents or squirrels. [SIZE=1][URL="http://public.fotki.com/blackfang/"]Pics[/URL] [B]08 KawasakiZZR 600- exhaust and other mods 98 Camaro Z/28 HT- some mods......street/strip car 07 Legacy 2.5i- SPT exhaust...daily driver[/B][/SIZE] Link to comment Share on other sites More sharing options...
idontknow Posted January 25, 2009 Author Share Posted January 25, 2009 It's already been the the dealership once! They pullled the P0457 code and I told them I could smell gas. They said the couldn't find any signs of leaks, cleared the code and sent me on my way. If I request a smoke test, will they know what it is? Link to comment Share on other sites More sharing options...
blackfang Posted January 25, 2009 Share Posted January 25, 2009 Yes because if there is a leak, they will see the smoke coming out of the system. They should have smoke tested it to begin with(if they have that equipment). [SIZE=1][URL="http://public.fotki.com/blackfang/"]Pics[/URL] [B]08 KawasakiZZR 600- exhaust and other mods 98 Camaro Z/28 HT- some mods......street/strip car 07 Legacy 2.5i- SPT exhaust...daily driver[/B][/SIZE] Link to comment Share on other sites More sharing options...
idontknow Posted January 26, 2009 Author Share Posted January 26, 2009 Okay. I'll call them today. Link to comment Share on other sites More sharing options...
idontknow Posted January 31, 2009 Author Share Posted January 31, 2009 The dealership pressure tested the system on the first visit and everything passed. I've ordered a new gas cap and hopefully the easy cheap fix it. BTW a P0457 is a MAJOR evap system pressure leak. Link to comment Share on other sites More sharing options...
blackfang Posted January 31, 2009 Share Posted January 31, 2009 I just re-checked, it is a gross leak, however, the diagnosis is for a fuel cap loose or off. The p0456 is a small evap leak. [SIZE=1][URL="http://public.fotki.com/blackfang/"]Pics[/URL] [B]08 KawasakiZZR 600- exhaust and other mods 98 Camaro Z/28 HT- some mods......street/strip car 07 Legacy 2.5i- SPT exhaust...daily driver[/B][/SIZE] Link to comment Share on other sites More sharing options...
idontknow Posted February 7, 2009 Author Share Posted February 7, 2009 Bought the new gas cap yesterday. I'll change it out and clear the code tomorrow. Hopefully that will fix it. I'll post results as soon as something does or doesn't happen. Link to comment Share on other sites More sharing options...
idontknow Posted February 13, 2009 Author Share Posted February 13, 2009 New gas cap didn't work. She goes back to the shop on Tuesday. We'll see what happens. Link to comment Share on other sites More sharing options...
flatsphere Posted February 26, 2009 Share Posted February 26, 2009 Hi there, Did you get that code resolved? I got the same code driving home last night. Coincidentally, my low fuel light came on about the same time. I refueled this morning, tightened the cap and reset the ECU with my AccessPort. No code so far. Cheers! Link to comment Share on other sites More sharing options...
flatsphere Posted February 26, 2009 Share Posted February 26, 2009 I've now driven over 200 miles and have not gotten the P0457 code again. We'll see how the rest of the week goes. Cheers! Link to comment Share on other sites More sharing options...
flatsphere Posted March 17, 2009 Share Posted March 17, 2009 The code has not resurfaced. Now have added about 2000 miles. Cheers! Link to comment Share on other sites More sharing options...
bigmatt125 Posted September 6, 2011 Share Posted September 6, 2011 Try this before you spend any money. It's really easy. (This description for for tubo models, but the principles are the same for non-turbo.) 1) If you smell a faint gas smell, don't worry about where you THINK you smell it; we are going to look at the engine. So... Pop the hood and take off the engine cover. Trust me, you have nothing to loose. 2) Face the engine and look at the right hand side of your intake manifold. There are three little hoses that connect to metal tubes. The middle hose is an evap hose. The top and bottom hoses are fuel supply. Inspect the middle hose. 3) Follow the middle hose under the intake manifold with a flashlight and find small hose clamps that are tightened by Phillips-head screws. They easy to see. 4) Those little clamps are prone to vibrate loose. Make sure that they are secure. Hint: Do this immediately after shutting down the engine and you MIGHT be able to hone in on the leak by smell and sight. Believe me, it you find the leak here, you won't believe you originally thought the smell was coming from the back of the car. Caution: Don't go nuts and over tighten the clamps. If you find a loose one, you'll know it! Also, don't worry about resetting the code. It will go off after a few starts if you fixed the leak. I actually prefer to let the light turn off naturally. Now use the money you saved and by yourself a nice dinner alone because I know no one would be seen with you in that nerdy Subaru! They don't understand. Good luck! Link to comment Share on other sites More sharing options...
BLiTzd Posted August 9, 2016 Share Posted August 9, 2016 Any other causes for this code? I had my car smoke tested we didn't find any leaks. We even smoke tested that little hose in the middle on the right side Of The engine. This is a tough one to figure out smh... Link to comment Share on other sites More sharing options...
FJuan Posted August 9, 2016 Share Posted August 9, 2016 Any other causes for this code? I had my car smoke tested we didn't find any leaks. We even smoke tested that little hose in the middle on the right side Of The engine. This is a tough one to figure out smh... Are you smelling any gas? My wife's balls are delicious. Link to comment Share on other sites More sharing options...
BLiTzd Posted August 9, 2016 Share Posted August 9, 2016 Any other causes for this code? I had my car smoke tested we didn't find any leaks. We even smoke tested that little hide in the middle on the right side in the middle. This is a tough one to figure out smh... Link to comment Share on other sites More sharing options...
BLiTzd Posted August 9, 2016 Share Posted August 9, 2016 Yes I smell gas but we smoke Tested it from the intake and the evap line on the right no leaks Link to comment Share on other sites More sharing options...
BLiTzd Posted August 9, 2016 Share Posted August 9, 2016 Originally I was leaking out of the turbo inlet so I put a new mishimoto turbo inlet and the leak was gone. I replaced the gas cap last week too. Link to comment Share on other sites More sharing options...
BLiTzd Posted August 20, 2016 Share Posted August 20, 2016 Just so everyone is aware we found the reason for this code on my car. The gas tank had a small crack near the edge of the tank where the welding meets. we found this by smoke testing the car while it was about 5 feet in the air and seen smoke coming out near the tank. problem with this fix is its expensive and takes forever. you need to take off the control arms and sub frame to get to the tank. I found a tank at one of my local u pull its for $100 but all in all that code is gone now and I was able to pass inspection. Link to comment Share on other sites More sharing options...
p0457subie Posted January 7, 2018 Share Posted January 7, 2018 Hi been an avid follower here and did not mean to hijack this post. but I have. a 2006 legacy with 255000 miles. I've been grtting the darned 0457 on/off in the past year during warmer and hot months. and this occurs like on for 4-5 days then off4-5 days and back on. anyway I am in Chicago with the cold frigid temp and I notcied it go has not been on for 1-2 months. so question - what is the problem with this? I did get a used Evap canister from junk yard last w summer and replaced it but light would still come/ go as stated above. also I did get th code(0823?) for the neutral position switch and that was changed about the same time th 0457 stop coming on. I don't think these 2 parts are related as one is electrical and other is fuel. love to get your insight to this thanks! Link to comment Share on other sites More sharing options...
relative4 Posted January 7, 2018 Share Posted January 7, 2018 As explained several times above in this thread, you need a smoke test. Link to comment Share on other sites More sharing options...
BLiTzd Posted January 9, 2018 Share Posted January 9, 2018 Mine ended up being a small leak in the weld on the gas tank. we had to lift the car up in the air and smoke the evap and finally after weeks of trouble shooting boost leaks and evap we seen it coming out of the gas tank. Link to comment Share on other sites More sharing options...
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