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Posted on Aug 27, 2008
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Check engine light on after overfill the tank. Check for codes at autozone, Change gas cap. Erase code. Ligth back on. Again to autozone. They say it is the gas cap. I let them know i have just replaced it the day before. The say it is the only thing showing and clear the code again. 48 hours later the ligth is on again.My elantra is a 2000 an has almost 100.000 miles

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  • dennisjs1 Dec 03, 2008

    I have the same problem replaced the gas cap as recommended and the light came back on two times and is still on. They seem to think it is the charcoal cannister in the fuel system but right now they keep trying things that don't work. First they said the code was for a weak battery and then replace the gas cap now they want 375 to replace the filter.

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Marvin

Marvin

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  • Hyundai Master 85,242 Answers
  • Posted on Aug 27, 2008
Marvin
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Joined: Jun 20, 2008
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You have a leak in the fuel system somewhere or a bad evaporative system sensor, the way the system works is the control module for the emission system pulls a vacuum on the gas tank and lines to check for leaks, if it can't get a certain vacuum level for a specified time it decides there is a leak and the check engine light comes on. This may be covered under the Federal Emissions warranty, call the dealer and inquire if the Evap System is covered.

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How to reset Service Engine Soon light after replacing gas cap? Took to AutoZone when the Service Engine Soon light came on Error code P0440.
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CHECK ENGINE LIGHT WENT ON AFTER GETTING GAS
When the Fuel Cap is not attached, your fuel tank loses pressure and a sensor detects this. This causes your Check Engine Light to come alive. Replace the cap and wait for the code to disappear or go to Autozone and have them clear the code for you.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

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Here is a good one. I have a 2005 Equinox that we just bought. Went to put gas in the tank and after I was finished I tried to put the gas cap back on and it wouldn't lock down. I figured that the...
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Engine check light comes on and stays on for awhile then goes off. Dometimes when I fill the gas tank the check engine light comes on. is something to do with the gas cap or the instrument lights.
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Check engine light came on after, open gas cap sign, for some reason can not be checked with the computer?
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