Question about Hyundai Elantra

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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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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.

Posted on Aug 27, 2008

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