Programming Evo all for Lincoln navigator with 2 keys

Question

I follow programming proceedure 2. I install the first key for 3 seconds and the yellow light comes on. I remove it and install the 2nd key and then the red light flashes once.  Then I remove it and press the program button and the red light flashes once quickly/weakly.   I use the remote start which powers the accessory wire but never get the red light 10 flashing times. The red light just stays on.  Can you tell me why the programming is no working?

Answer 1

One of my keys is an aftermarket key. Could that be a problem?

Comments

Both keys should be master keys programmed by the dealer. The keys  made elsewhere are only clones. So the the vehicel never actually recognizes key1 and key2. It see key1 and key1.