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Q:

can i reprogram a new lock cylinder and key myself or do is that a dealer only? on 2004 Honda CR-V

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the cylinder was bad, so i gave the dealer my vin to get a new cylinder and keys and the "key" light is flashing and car wont start
(1) Answer
If you still have the old assembly , swap the immobilizer unit from the old one , otherwise , yes it needs to be programmed for the new unit in order to work.THIS is assuming that you had them re-key the new ignition to match the original car key(s)..................OR find another car the key fits , that does run and take it.