I have a Ford C-Max 2011 year, it only has one key that doesn't have a remote control. I tried to teach it an Xhorse universal remote control, but it didn't work. I bought a Ford remote control and it can't be taught either. When I turn the ignition on 4 times, it beeps, but after that, no matter what combination I try, it doesn't synchronize. The key has a 4D+ transponder. How can I check if the car is receiving the signal? Or any ideas?