my Toyota Highlander XU70 (2020-Present) is making a rattling noise at idle

Solution

1. Preparation

• Gather necessary tools: OBD-II scanner, socket set, torque wrench, pry bar, flashlight.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Tighten Components

• Sub-steps:
  • Using a socket set, check and tighten all exhaust system bolts and brackets.
  • Inspect and secure any loose heat shields with appropriate fasteners.
  • Tighten engine mounting bolts as per manufacturer's torque specifications.

3. Replace Worn Engine Mounts (if applicable)

• Sub-steps:
  • Remove the air intake assembly for access to the engine mounts (if necessary).
  • Using a socket set, remove the bolts securing the worn engine mount.
  • Carefully lift the engine using an engine hoist or jack to relieve pressure on the mount.
  • Install the new engine mount, ensuring proper alignment.
  • Torque the mount bolts to specifications as outlined in the service manual.

4. Inspect and Clean the Exhaust System

• Sub-steps:
  • Check for any cracks or holes in the exhaust pipes and muffler.
  • Remove any loose debris or foreign objects from the exhaust system.
  • If damage is found, replace the affected components.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle to check if the rattling noise persists.