Fabia 1.2 2011, the car locks itself when you close the driver's door (left), and also with other vibrations in the body, have changed the lock box but the error persists.

Sounds like broken wires in the door to body bellows. With the door open, can you put something in the door lock to latch it, making the car think the door is shut, then wriggle the bellows with the ignition on.

My daughter's FII had this problem, but in the passenger lock.

Use the search. It was a small circuit board which I temporarily fixed - for 1 year. Then put a new lock in.

But also check for broken wires by wriggling the loom in the door space.

Is the circuit board in the lock case

HI,

 

Have a read through here -

I put plenty of pictures on.