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Old 03-28-2004, 10:44 AM   #1
Scobby29
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Default check engine light...Gas cap????

my check engine light keeps comming on and the test at autozone said i have a the my gas cap was of or loose and that it will cause a leak or something....so i tighten the gas cap take negative off reset ecu and check engine goes away....week later comes back on get it tested same thing.....but its not loose at all and i make sure the car is off before i open it what the hell is wrong???
-Nick
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Old 03-28-2004, 10:53 AM   #2
badkid
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Get your CEL code identified at Autozone. It will identify what's causing the light to come up.
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Old 03-28-2004, 11:36 AM   #3
Karl
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If it is indeed the emission leak CEL, the gasket on the gas cap can be bad.
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Old 03-28-2004, 01:31 PM   #4
RussB
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is your car stock?
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Old 03-28-2004, 02:31 PM   #5
BIG GUN
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When you put your gas cap back on after filling your tank, it has to click at least 3 times, or the cel will come on. This happened to me twice, before I figured it out. It drove me nuts!
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Old 03-28-2004, 02:33 PM   #6
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Do you have an aftermarket fuel pump?
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Old 03-28-2004, 04:18 PM   #7
Scobby29
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Quote:
Originally posted by cronic
Do you have an aftermarket fuel pump?
no stock fuel pump

Quote:
Originally posted by Karl
If it is indeed the emission leak CEL, the gasket on the gas cap can be bad.
does this mean to just get a new gas cap or is it more in depth???
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Old 03-28-2004, 05:14 PM   #8
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There is a device to check for the seal of the gas cap (It's some kind of vacuum pump/gauge that you can pump down to check for leaks with the gas cap). That should be able to determine whether your gas cap gasket is bad or not.
Probably have to get it back to the dealer for that, but remember, emission related stuff should have a longer warranty than the normal one. So you may still be covered.
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Old 05-05-2005, 01:39 PM   #9
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I am having the same problem but I DO have and aftermarket walborro 255lph fuel pump. Could the aftermarket fuel pump somehow be effecting the sensor for my gas cap? The code says it's the gas cap and I am begining to suspect the tank may be compromised. Just wondered if any one has any more thoughts onb the matter.
Thanks
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Old 05-05-2005, 02:15 PM   #10
Got Groceries?
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It may not be the cap. I had the same code, and it turned out to be a loose/disconnected hose behind the alternator. I was also getting a strong fuel smell at times. Took multiple trips to the dealer for them to find anything.
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Old 05-05-2005, 02:29 PM   #11
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Another cause is that the seal for the pump assembly may not be on correctly. A buddy of mine had that problem and after he unbolted it and bolted it back up again making sure the seal was on correctly, the problem went away.
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Old 05-05-2005, 02:30 PM   #12
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No surprise there, dealers often have seemingly incompetent mechanics and charge out the ass. I have no intention of taking mine to the dealer because I know they would just throw on a new gas cap and tell me it's fixed, then some odd, but low milage later the light would be back on. They never seem to take the time to diagnose things effectively. I think they are just plain lazy, and uninterested.
Checking the hoses and fuel pump seal seems like a good idea, thanks. I thought it was just tank pressure being monitored. I don't even know where the sensor is.
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Old 05-05-2005, 02:33 PM   #13
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double posted...
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Old 05-05-2005, 03:23 PM   #14
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Quote:
Originally Posted by Got Groceries?
It may not be the cap. I had the same code, and it turned out to be a loose/disconnected hose behind the alternator. I was also getting a strong fuel smell at times. Took multiple trips to the dealer for them to find anything.
Yes, this has been known to cause a P0457 trouble code. There's also a charcoal cansiter at the rear of the car on the passenger side - make sure its hoses are all connected, too. If you bought the car used, its fuel pump may have been swapped out and then back in - sometimes its gasket is crimped during that process.

If you still haven't found the culprit, it might be living in your ECU. Subaru has a reflash (not documented in any TSB) for 2002 WRXes that corrects some programmed tolerances that caused certain spurious trouble codes - P0457 is one of them.
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Old 05-05-2005, 03:25 PM   #15
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It means there is a leak in the gas tank system somewhere. Most commonly it is a gas cap. Any place that does smog testing can test your cap. (It's part of the smog test) Any hose or seal can cause the leak. If you have a new fuel pump, that could be it. It could also be one of the hoses to the charcoal canester. Just start with the obvious and work back.
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Old 05-05-2005, 05:32 PM   #16
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From my experience with emissions related bullcrap, here's what i've found are the most common causes..

1. Loose gas cap
2. Aftermarket gas cap
3. Charcoal canister
4. A non-working vacuum switching valve in the evap system
5. Cracked, pinched or removed hose.

The fuel pump cover gasket could cause it too. If you have an aftermarket gas cap.. get rid of it, and buy a stock one. These systems are that damn picky these days.
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Old 05-09-2005, 03:01 PM   #17
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had the same code. diagnoses? it was the same emissive solenoid that others here have mentioned (the one right to the left and under the alternator). one of the black nipples was sheared right off and the vac hose was just hanging there. ordering a new solenoid now.
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Old 05-09-2005, 03:37 PM   #18
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^^^^waht he said
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