I just picked up a 2004 EX civic that came with no remote but the dealer assures me it had keyless entry from the factory since it has power door locks and windows. Sounds not very plausible to me but anyways. Anyone have a pic of the 04 remotes? I'm searching online for one to buy one but finding so many variations of the remotes, not sure which one I need.

 

I believe P/N - 72147-S5A-A01 is what you are looking for.

 

cheaphondaparts.com doesn't have that PN for some reason. I googled it and found some various links, one site says it's for 05 Civics. I'll keep looking.