I wanted to replace my key and separate fob with a AliExpress one-in-all key.
I searched and found and ordered this one. I got the new key to a locksmith. When I insert my new key there's a security-light that won't turn off (car with a lock).
So I assume there's a chip in the key itself, wenn I hold the old one next to the ignition when inserting the new one the car starts, without it won't.
I found a learning routine, but it doesn't work (after 13min the logo didn't leave, so I didn't proceed). Maybe my chinese key doesn't have it in the main body.
I also couldn't program the fob. No problem with the old key, when pressing both buttons on the new one nothing happens.
1) Do the german cars have a different fob frequency?
2) does programing only work when the key was learnt by the car?
Maybe my new key doesn't have the necessary chip??
Thank you all in advance!