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Why is my 2020 Highlander's engine making a knocking noise? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/Why is my 2020 Highlander's engine making a knocking noise?

Why is my 2020 Highlander's engine making a knocking noise?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
582 words

Problem Statement

Learn how to diagnose and fix a knocking noise in your 2020 Toyota Highlander with these detailed steps and required tools.

Affected Component
engine

Symptoms

  • •Knocking noise emanating from the engine compartment.
  • •Noise may vary with engine RPM (increases with acceleration).
  • •Potential loss of power or reduced engine performance.
  • •Possible illumination of the check engine light.

Diagnostic Steps

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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

  • •Mechanic's stethoscope or a long screwdriver
  • •OBD-II scanner
  • •Torque wrench
  • •Compression tester
  • •Basic hand tools (sockets, wrenches, screwdrivers)
  • •Jack and jack stands or a vehicle lift
  • •Oil catch pan (if removing the oil pan)

Additional Information

Affected Component
engine
Difficulty
medium
Severity
medium
Tools Required
7 items

Related Faults

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Tools Required

  • Mechanic's stethoscope or a long screwdriver
  • OBD-II scanner
  • Torque wrench
  • Compression tester
  • Basic hand tools (sockets, wrenches, screwdrivers)
  • Jack and jack stands or a vehicle lift
  • Oil catch pan (if removing the oil pan)
Repair Instructions

If the Knock is from Loose Components

  1. Tighten Loose Bolts/Fasteners
    • Follow the specified torque settings in the service manual for each component.

If Related to Oil Issues

  1. Change Engine Oil
    • Drain the old oil and replace it with manufacturer-recommended oil and filter.

If Compression Test Indicates Low Compression

  1. Inspect and Replace Worn Components
    • If low compression is found in any cylinder, consider replacing piston rings or valves for that cylinder.

If the Knock is Due to Timing Issues

  1. Adjust Timing Components
    • If timing is off, realign the timing chain/belt according to manufacturer specifications.

If Rod Knock is Confirmed

  1. Engine Rebuild/Replacement
    • If rod knock is confirmed, the engine may need a rebuild or replacement of bearings, rods, or the entire engine depending on the extent of the damage.
Conclusion

A knocking noise in the engine of a 2020 Toyota Highlander can result from various issues ranging from minor to severe. Following the diagnostic steps systematically will help isolate the issue. Always refer to the vehicle's service manual for specific torque settings and procedures. If in doubt, consult a professional mechanic to prevent further damage to the engine.