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[RedRocket]

You are very confusing...your English translation & poor syntax is very difficult to understand.

What is your native language that you speak ?

1.There are NO U-boat songs...do you actually mean U-boat sound ???
2.Do you only have 2 AL-P Sensors & both are installed on the Rear of your car ?

[syrinx]

You are very confusing...your English translation & poor syntax is very difficult to understand.

What is your native language that you speak ?

1.There are NO U-boat songs...do you actually mean U-boat sound ???
2.Do you only have 2 AL-P Sensors & both are installed on the Rear of your car ?

I'm French native speaker.

1) I use the optional ALP speaker. The 'music' at the start of the ALP is a kind of 'beep beep beep' as a U-boat submarine. I hear it at start if there is no error (with the front CPU and the 2 rear sensors).
2) I have a CPU for front (2 sensors) and the faulty rear CPU for the rear (2 other sensors). I have tested the 2 rears sensors with the front CPU as reported.