why is my Toyota Highlander Third Generation (2014-2019) engine making a rattling noise

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, rubber mallet, flashlight
• Disconnect the battery before starting any work to ensure safety.

2. Check Engine Oil

• Remove the oil dipstick and wipe it clean.
• Reinsert the dipstick, remove it again, and check the oil level.
• If low, add the appropriate grade of oil (5W-20 or as specified in the owner's manual).
• If dirty, proceed to change the oil and filter.

3. Inspect and Tighten Heat Shields

• Visually inspect the heat shields for any loose brackets or damaged parts.
• Use the socket set to tighten any loose bolts or screws on the heat shields.
• If damaged, replace the heat shield with a new part.

4. Examine Engine Mounts

• Use the socket set to remove any bolts securing the engine mounts.
• Inspect each mount for cracks or excessive wear.
• Replace any damaged engine mounts with new ones, ensuring to torque to manufacturer specifications.

5. Timing Chain/Belt Inspection

• Remove the engine cover to access the timing chain or belt.
• Inspect for slack or signs of wear such as fraying.
• If worn, replace the timing chain/belt according to the manufacturer’s guidelines, ensuring proper tensioning.