I'm not 100% sure, but I suspect you are experiencing errors because you've bought a steering wheel designed for SP18 hardware cars (e.g. G20 3er, G01 X5, G15 8er etc. with "Driving Assistant Professional") as opposed to SP15 cars (e.g. Pre-LCI G30 5er, G01 X3 with "Driving Assistant Plus").
The SP18 cars have some additional driving assistance features such as the light bars above the steering wheel buttons and the assisted driving mode button (bottom right button on the left-hand-side controls).
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