EBS 4601: Wheel brake lining wear sensor 3: Too much difference between 2 signals on this and the other side of the axle.
Error status: FMI 0 - error not specified. Error indication: Central STOP warning lamp (H111) lights up yellow. Effect of Error: None of the user functions are restricted. Cause of error: Mechanical wheel brake error. Troubleshooting: Check the brake cylinders and brake linings on this axle.
So you need to check the lining wear on the 2nd axis and find the reason for the differences in their thicknesses.