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Two ways the Check Engine Light (CEL) can be reset: (1) use an OBDII scanner to reset it, or (2) disconnect the NEGATIVE battery cable for about three minutes , then re-connect. The latter will make the engine run rough for a few miles because you will also be erasing information stored in the computer that applies to performance. After a few miles, the computer will "re-learn" and everything will be back to normal. If the CEL comes on again, you definitely need to take the vehicle to Auto Zone or another place that will scan the codes stored in the computer and give you the diagnosis of what's causing the CEL to come on.
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