98 civic check engine light

After turning the car on/off several times yesterday while replacing the blower fan, the check engine light suddenly came on.. I have unscrewed the
gas cap several times and tightened it but it is still there..
Any other ideas on how to remove it? I know that it might be an actual error but this has happened in other cards and there seem to be ways to make it disappear. Thanks
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Michael Gazer wrote:

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The answer is probably in the glove compartment. Book says you're supposed to tighten the gas cap, then the car will wait 'three trips' to reset the light.
'Curly'
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Take it to an Autozone or somewhere else and have the codes read. That is the only way to determine the problem.

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