1. Lack of lubrication: If the steering rack or other components of the steering system are not properly lubricated, it can cause a grinding noise when the steering wheel is turned. To fix this, you can apply a lubricant specifically designed for steering systems.
2. Damaged steering rack: The steering rack is a critical component of the steering system, and if it becomes damaged, it can cause a grinding noise. Signs of a damaged steering rack include difficulty turning the steering wheel or a loose steering feel. If you suspect that your steering rack is damaged, it's important to have it inspected and repaired or replaced as soon as possible.
3. Worn out tie rod ends: The tie rod ends connect the steering rack to the wheels, and if they become worn out, they can cause a grinding noise when the steering wheel is turned. Tie rod ends are relatively inexpensive and easy to replace, so if you suspect that they are worn out, it's worth having them checked and replaced.
4. Faulty power steering pump: The power steering pump provides hydraulic pressure to the steering system, and if it becomes faulty, it can cause a grinding noise. Signs of a faulty power steering pump include whining or groaning noises when turning the steering wheel or difficulty turning the steering wheel at low speeds. If you suspect that your power steering pump is faulty, it's important to have it inspected and repaired or replaced as soon as possible.
If you are not mechanically inclined or do not feel comfortable diagnosing and repairing the issue yourself, it's best to take your Audi A4 to a qualified mechanic for inspection and repair.
