Now, I use the front CPU, I've connected these 2 sensors on F1 and F2. I get the "Uboat" song (I don't have it with the rear CPU) at the startup, no error message, the right sensor doesn't work as parking sensor, the left works well. But both detect my laser tester. I have the same results when I reverse the 2 rounds plugs of the cables.

I think my right sensor and the rear CPU are wrong. Do you agree?

Thanks.