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What should I do if my 2020 Highlander's engine makes a knocking sound? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What should I do if my 2020 Highlander's engine makes a knocking sound?

What should I do if my 2020 Highlander's engine makes a knocking sound?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-5 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
668 words

Problem Statement

Learn how to diagnose and repair a knocking sound in your 2020 Toyota Highlander with step-by-step instructions and required tools.

Affected Component
engine
Estimated Time
2-5 hours

Symptoms

  • •Engine knocking sound during idle or acceleration
  • •Reduced engine performance
  • •Potential warning lights on the dashboard (e.g., check engine light)
  • •Possible vibrations felt through the cabin

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Oil dipstick
  • •clean rag
  • •Torque wrench
  • •socket set
  • •Spark plug socket
  • •multimeter
  • •oil filter wrench
  • •oil catch pan
  • •new oil and filter
  • •ratchet
  • •engine hoist
  • •comprehensive tool set

Additional Information

Affected Component
engine
Estimated Time
2-5 hours
Difficulty
medium
Severity
medium
Tools Required
13 items

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Diagnosing and Repairing a Knocking Sound in a 2020 Toyota Highlander
Repair Instructions

If the knocking is due to low oil or oil quality:

  1. Change Oil and Filter
    • Tools Required: Oil filter wrench, socket set, oil catch pan, new oil and filter
    • Steps:
      1. Raise the vehicle using a jack and secure it with jack stands.
      2. Remove the drain plug and allow oil to drain completely.
      3. Replace the oil filter.
      4. Reinstall the drain plug and refill with the correct type and amount of engine oil.
      5. Start the engine and check for leaks and knocking sounds.

If the knocking is related to ignition or fuel issues:

  1. Replace Spark Plugs or Ignition Coils
    • Tools Required: Spark plug socket, ratchet, torque wrench
    • Steps:
      1. Remove the ignition coil from the affected cylinder.
      2. Replace the spark plug with a new one, ensuring it is gapped correctly.
      3. Reinstall the ignition coil and repeat for each affected cylinder.

If the knocking is from internal engine components:

  1. Addressing Internal Engine Issues
    • Tools Required: Engine hoist, comprehensive tool set, torque wrench
    • Steps:
      1. If the source is determined to be the connecting rod, crankshaft, or other components, you may need to remove the engine.
      2. Disassemble the engine as per the service manual.
      3. Inspect bearings, pistons, and connecting rods for wear.
      4. Replace damaged components and reassemble the engine.
      5. Ensure all torque specifications are followed during reassembly.
Final Steps
  • After repairs, clear any diagnostic trouble codes using the OBD-II scanner.
  • Test drive the vehicle to ensure that the knocking sound has been resolved and monitor for any abnormal sounds or behaviors.
  • If the knocking persists after all checks and repairs, further investigation may be necessary, possibly involving a specialist for a comprehensive engine evaluation.
Conclusion

Always remember to refer to the vehicle's service manual for specific torque specifications and repair procedures particular to the 2020 Toyota Highlander. If the issue remains unresolved or if the engine is severely damaged, consulting a professional mechanic or dealership is recommended.