I have also problems with starting. When turning the key, sometimes it does not start and the LED in the door flashes. When I remove the key, wait for the interior lights to switch off, sometimes it starts and LED is on continuously. My car has no remote control for locking/unlocking the doors, the key only contains a led and one battery. I think this is not a technical fault but a security that kicks in when using the key wrongly, for example turning in the wrong direction when locking/unlocking the doors? The spare key does not have a battery or led, I did not use it yet. Can you explain this behaviour?