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Disconnecting the battery is not the way to clear the codes on that car. Drive it for a while and if the problem has been fixed, the CEL will go out on its own. If not, have the code(s) read and do a proper diagnosis.
There is a number of cycles/etc. that the OBDII system has to go through without the fault for the CEL to go out.
Or, you could just read the codes now, clear them (using a scanner) and see if the light returns. If so, you have to resolve the problem to keep the light off.
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