I purchased 2 of these, and with my 2 working keys, add the other two on my 2017 Explorer Sport.STEPS:1. You must have two working IA keys in the car. Have your doors shut, and the car off.2. Insert the 1st working key into the key slot in the center console. Key ring up buttons out.3. Push the start/stop button and wait 5 seconds.4. Push the start/stop button.5. Remove the 1st key and place the 2nd working key in the key slot in the center consule. Key ring up buttons out.6. Push the start/stop button and wait 5 seconds.7. Push the start/stop button.8. Remove the 2nd key and place the new key to be programmed in the key slot. Key ring up buttons out.9. Push the start/stop button and wait 5 seconds.10. Push the start/stop button.The door locks should cycle and you will get a key successfully programed message on the left dash display.If you mess up in the process you can restart by opening the driver door and closing it again.