The immobilizer system works in 3 parts. The key, the immobilizer unit and the ECU. If any one of these is out of sync, it will result in a no-start. I just did a key cylinder swap on a Prelude (same system). The new part came with a new immobilizer unit and keys that needed to be brought to the dealer for programming. What I did was I reused the existing immobilizer unit, took the keys to the dealer and had they clone the code from the old key to the new and it works like a charm. If you have new keys cut, it would probably be a more cost effective solution to have a RFID clone over onto the new keys then paying more and have a complete reprogram.