Looking for diagnostic software

In holland drive really little original in holland approved V8 boliden, after all he cost at that time 100,000 euro, yes 2X so much, and the steering goes here according to the weight of the car!!!! I have such a rare exemplar, a delusional car!!! On my V8 3.6 I have already renewed almost all covert parts, and after a long standing the automatic no longer works, it switches in the emergency program! After that the drive shafts cleaned up with the ABS sensors's un still the same.
I think I need a diagnosis to eliminate the problem, but can one help me?

Thank you, Robert from Holland