Doku Golf 1J, Vibrations and Rumble Noises with 4Motion (Solution)

Vibrations in the steering wheel and seat at approximately 120 km/h.
Thumping noises at approximately 150 km/h.

Cause:
Imprecise centering of the wheels on the wheel hubs.
Wheel imbalances.
Incorrect alignment of the torque marks on the driveshaft and Haldex coupling.
Loose drive shaft in the wheel bearing.
Imbalance in the driveshaft.

Solution:
Please check the alignment of the wheels on the wheel hubs and, if necessary, correct it.
Check for dynamic and static wheel imbalances, and correct them if necessary.
For further analysis, please record the measured values of wheel imbalances.

Please verify the correct alignment of the imbalances based on the color markings on the driveshaft and the Haldex coupling.
Check the secure fit of the drive shaft in the wheel bearing by performing a sound test on the suspended wheel. If the sound is high-pitched, the drive shaft is loose in the bearing. In that case, tighten the drive shaft using the new center nut. If the play persists, inspect the relevant wheel bearing for damage and replace it if necessary.
Rotate the driveshaft 120 degrees relative to the Haldex coupling flange. If the driveshaft is balanced, please remove the balancing weights (cup-shaped washers). Repeat the process if the first attempt was not successful.