Do I need my other keys?

All existing, working keys must be present during the pairing process. Some vehicles once you pair a new remote or key, all previous remotes or keys will be erased from the memory. The others will not be functional until you pair them again.

Verify in the instructions manual if your vehicle has a process that erases all keys or remotes. It will be clearly listed in the instructions. But all processes will require the use of a working original key.