I had the same problem. I went to the kia dealer and they checked the code that caused the light to be on and found I had a leak in the gas cap. They replaced the gas cap and the problem went away. You night need to find out what made the check engine light go on in the first place.
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First, you need to determine WHY the check engine light is on. It COULD be a faulty gas cap and if it is, be sure to replace with one EXACTLY like the one from the factory otherwise your check engine light will come on again.
Go to AutoZone (or other auto parts store) and ask to 'borrow' their code analyzer.
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The gascap light means you may not have the gas cap on tight, or it may be faulty. The check engine light means the computer has found a problem that will affect performance and-or emissions. Such as a leaking gas cap. If the gas cap is ok, you may need to get the computer scanned for trouble codes to proceed with testing.
Replace the gas cap a faulty gas cap will cause this to light up if they checked for codes and there were no codes change out the gas cap. Gas caps can and do go bad they get to where they no longer maintain the pressure within Causing your check engine light to light up.
a faulty gas cap could cause an engine code to come on with-out and engine problems if you have to do emission tests or smog tests where you live the one thing there to check it that the gas cap is operating properly. but it could also be a sensor when the engine light comes on the car operates in what is called open loop mode the engine runs in preset peramiters set in the ECM it also runs in this mode til the vehicle is at operating temperator so even if the vehicle seems to be running ok the engine light isn't something that sould go unchecked