topic can be closed
Resolution: took it to the repair shop where they have cleaned all child lock wired connections in the door and it worked. No software updates needed.
Root cause: possibly low car battery lvl at some point
Audi A4 B9 2017 TDI - "Child lock fault: please contact workshop" Please visit Service error appeared. Even though the error is present on the dashboard for 6 month already, both child locks (left and right) work as expected, meaning if you press child lock button on the driver's door the door...
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