my Toyota Highlander XU70 (2020-Present) makes a knocking noise when starting

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts.

2. Inspect Engine Oil

• Sub-steps:
  1. Remove the dipstick and check the oil level; add oil if it is low.
  2. Check the oil for signs of contamination or metal shavings.
• Tools Required: Oil dipstick, funnel, appropriate engine oil.

3. Check Battery and Connections

• Sub-steps:
  1. Inspect the battery terminals for corrosion or loose connections.
  2. Use a multimeter to check battery voltage; it should read around 12.6 volts or higher.
  3. Clean terminals as needed and tighten connections.
• Tools Required: Multimeter, battery terminal cleaner.

4. Inspect Engine Mounts

• Sub-steps:
  1. Visually inspect engine mounts for cracks or separations.
  2. Use a pry bar to check for excessive movement in the mounts.
  3. Replace any faulty engine mounts.
• Tools Required: Pry bar, socket set.

5. Inspect Timing Belt/Chain

• Sub-steps:
  1. Remove the timing cover as needed (refer to service manual).
  2. Check for proper tension and alignment of the timing belt/chain.
  3. Replace if there are any signs of wear or misalignment.
• Tools Required: Socket set, torque wrench.