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I have a 2004 Kia Optima. My keyless entry remote stopped working so I changed the battery but it still wont unlock/lock the doors.  I think it needs to be re-programmed but I dont know how to do it.  If anyone could help that would be great.

Thanks!  

Wow, I'm so glad that you're asking this!  I actually work for a company that makes keyless entry system.  Just click on the link

~SolsticeMan~  
keyless entry

What a useless reply.  The implication is just to buy a new one.  He ASKED how to program it.  

2004 Kia Optima car has a special program in the keyless and it must be reprogrammed if a problem occurs. actually it is not difficult to reprogram.