GRA Error After Activation? Troubleshooting Guide.

Hello.
I have another question about the topic of GRA.
I installed the lever. Vehicle: Audi A4 (8E, year 2002).
Then, use VAG-COM (Release 311.2-N Freeware) to read the error codes from control unit 01. The result: no errors.
Login 11. The unlock code 11463 also worked. I was able to read data, and I received a 'G'. So far, so good. However, there was then an error in the engine control unit: 17977 - GRA switch, implausible signal detected.
I then tried to modify the value in control unit 16 (no error code registered). In the coding section (07), a value of '00011' was entered, which I wanted to change to '00041', but it wouldn't take. It always reads back as '00011'.
Then I read the error codes again from control unit 01, and in addition to the implausible GRA signal, I now have a second entry: 18107 - Data bus fault, missing message from the steering column electronics.
Can someone tell me what I'm doing wrong?
Is my LEMKS control unit faulty? I can access it, but I can't read any error codes. Also, everything else seems to be working normally.

THX.

Maybe not broken, but just the wrong one?
There are also steering column control units that simply do not support this feature, in which case you would need to purchase a new one.

What part number is being reported from the steering column?