Honda 2007 accord ex Ignition lock assembly with new key does it need programming

 

Yes. But maybe it's not too late. Do you have the old keys? Can you get a locksmith to re-pin the new cylinder to accept the old keys? That would eliminate the reprogramming.

Another possibly way, I'm not sure about this. Inside the new key, take it apart as if you're putting a new battery into the key. There should be a little chip in there somewhere, I don't think it's actually embedded in the molded plastic. (Not the printed circuit board, but just a little chip by itself.) That chip contains the serial# that the immobilizer is looking for, so swap that chip into your new keys. The one that won't work is the valet key, that one has the same chip embedded in the molded rubber handle.

Then there's the ghetto method... You still need the old key to open the door, for example if your car battery dies and you need to use the key blade to open the door. With that key on your key ring, it will probably satisfy the immobilizer just because it's there.