What causes the abnormal noise when a Volkswagen passes over speed bumps in winter?

The abnormal noise when a Volkswagen passes over speed bumps in winter is caused by aging and cracking of parts near the stabilizer bar, or by a faulty shock absorber. In such cases, it is recommended to seek professional maintenance personnel for inspection and repair.

If abnormal noise occurs when passing over speed bumps, you can park the car on level ground and have one person stand on each side of the car, shaking it vigorously from side to side. If a creaking noise is heard, the rubber buffer blocks on the stabilizer bar may be the issue. In this case, it is advisable to repair the stabilizer bar or replace the parts.

When it is not raining or the car has not been washed, check for oil leaks on the shock absorber housing or dust cover. Alternatively, during low-speed driving, if a hollow sound is heard when the wheels pass over road bumps or experience slight vibrations, it indicates abnormal noise from a damaged shock absorber. If the shock absorber is faulty, it can only be replaced and cannot be repaired.