why does my BMW 5 Series have a high-pitched noise when turning the steering wheel?

Solution

1. Preparation

• Gather tools: socket set, torque wrench, fluid catch pan, power steering fluid, safety gloves.
• Disconnect the battery to prevent electrical issues during repair.

2. Inspect and Replace Power Steering Fluid

• Sub-steps:
  1. Locate the power steering reservoir.
  2. Remove the cap and check fluid level; top up with the recommended power steering fluid if low.
  3. If fluid is contaminated, use a fluid catch pan to drain the old fluid from the reservoir.
  4. Refill with fresh power steering fluid to the appropriate level.

3. Inspect and Replace Power Steering Pump

• Sub-steps:
  1. Remove the serpentine belt by loosening the tensioner pulley.
  2. Disconnect the power steering pump's inlet and outlet hoses; be prepared for fluid spillage.
  3. Remove the pump from its mounting location.
  4. Install the new power steering pump, ensuring all connections are secure.
  5. Reattach the serpentine belt and adjust tension according to specifications.

4. Check and Replace Steering Belt

• Sub-steps:
  1. Inspect the steering belt for signs of wear, cracking, or fraying.
  2. If damaged, loosen the tensioner and remove the old belt.
  3. Install the new belt, ensuring proper routing as per the vehicle's diagram.
  4. Adjust the tensioner to the specified tension.

5. Reassemble and Test

• Sub-steps:
  1. Reconnect the battery.
  2. Start the engine and turn the steering wheel from lock to lock to bleed air from the system.
  3. Check for leaks and ensure that the noise is eliminated.