What causes the steering wheel noise in Audi A6?

[OGenesis]

Audi A6L steering wheel noise when turning may be caused by: aging of the tie rod end ball joint; leaking of the steering gear dust cover; or contaminated power steering fluid. Below is relevant information about power steering systems: 1. Mechanical hydraulic power steering system: The mechanical hydraulic power steering system consists of a hydraulic pump, pipelines, and oil cylinder. To maintain pressure, the system always remains operational whether steering assistance is needed or not, resulting in higher energy consumption, which is one reason for resource consumption. This system is commonly used in economy cars. 2. Electro-hydraulic power steering system: The electro-hydraulic power steering system overcomes the shortcomings of traditional hydraulic power steering systems. Its hydraulic pump is no longer directly driven by the engine belt but uses an electric pump instead. All its working conditions are calculated by the electronic control unit based on signals such as vehicle speed and steering angle to achieve the optimal state.