Could you add remote keys and reprogram on Alero 2003 with power locks but without remote keys?

Yes, you can add and reprogram remote keys for a 2003 Alero with power locks, even if you don't have the original remote keys. You will need access to the vehicle's onboard diagnostics (OBD) system and a compatible key programming tool or software. Follow the specific programming procedure outlined in the vehicle's service manual, which typically involves a series of steps to enter programming mode and synchronize the new remote with the car's system. If you're unsure, it's best to consult a professional locksmith or dealership for assistance.