what causes my BMW 5 Series to drift left or right while driving straight?

Solution

1. Preparation

• Gather tools: alignment tools, socket set, torque wrench, and tire pressure gauge.
• Park the vehicle on a level surface and turn off the engine.

2. Tire Pressure Check

• Use a tire pressure gauge to check the pressure in all tires.
• Inflate or deflate tires to the recommended pressure specified in the owner's manual.

3. Wheel Alignment

• Using alignment tools, adjust the camber, caster, and toe angles to manufacturer specifications.
  • For camber, adjust the upper control arm or lower control arm as needed.
  • For toe, adjust the tie rods to achieve the correct angle.
• Tighten all components to the specified torque values as per the service manual.

4. Suspension Inspection and Repair

• Visually inspect tie rods, ball joints, and control arms for any signs of wear or damage.
• Replace any worn or damaged components:
  • Remove the old component using a socket set.
  • Install the new component, ensuring to torque to specifications.

5. Final Check

• After making adjustments or replacements, perform a test drive to confirm that the drift has been resolved.
• Recheck tire pressures after the test drive.