There is no on-board programming procedure for 2004 KIA Optima remote keyless entry. This vehicle requires special equipment be connected to the vehicle to program the keyless remote. You must take you 2004 KIA Optima to a local locksmith or your local KIA dealer for remote programming.
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Please make sure you have this CR2032 number on the old battery, if you have no battery available in your remote, you may find the battery number on the back cover of your Remote, Please give us a call if you have not found any numbers on your remote.