Hi. I have a 2018/2019 P400e Autobiography. 4 weeks ago, got in the car and usually procedure to start. She just would not start. At first, error message says autonomous braking system not available, then switches herself off. Everytime i tried it, she did the same. She would not start. Battery is fine. Everything else works in the car.
Towed to garage. They spent 3 weeks on it and they still cannot diagnose the fault. Theh cleared all the fault codes, still not startin.

Has anyone got any idea please. I'm very worried specially this is on contract hire and been paying monthly for not even using it.