Audi A6 body vibration at low speed cornering

      An ultra 210,000 km mileage Audi A6 4.2L sedan. Users reflect: the car at low speed cornering body vibration.
      Troubleshooting:
     (A) reflect this customer to our station, the vehicle body vibration at low speed cornering. Maintenance personnel found the car after the test at the speed of about 30km / h cornering, rear KESS V2 continuous vibration (dynamic jump). I stand with VAS5052 check this car, no relevant fault code, read data stream properly.
     (2) maintenance personnel through the rear axle differential fault analysis, after replacing some relief in the cool car, hot car remains the same, no troubleshooting.
     (3) Check the drive shaft and found no abnormalities.
     (4) Try replacing the Torsen differential, test troubleshooting, open black oil have found Torsen differential ablation phenomenon.
     Troubleshooting: Replace differential and differential oil.
     Failure Summary: not encountered such a fault before, nor have other cases and technical follow, to go one step overhaul detour. That seems more from the principles and theoretical analysis, troubleshooting good.
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