I made a set of keys without the immobiliser chip programmed and I had inserted this key into my engine ignition.
Now when I inserted my 2 sets of keys which I know worked, I couldn't start the engine. I suspect this has something to do with the immobiliser.
I thought an non-programmed key will only fail to start the engine but seems like it messes up with the whole security system and the old key wouldn't start now. Please let me know what I can do or who should I call to get it sorted.
Thanks very much in advance.
Ford Focus 2005