FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Why does my 2020 Highlander have a loud exhaust noise? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/Why does my 2020 Highlander have a loud exhaust noise?

Why does my 2020 Highlander have a loud exhaust noise?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and repair loud exhaust noise issues in your 2020 Toyota Highlander with step-by-step instructions and required tools.

Affected Component
exhaust system

Symptoms

  • •Loud exhaust noise, especially during acceleration.
  • •Noise may vary with engine RPM or load.
  • •Possible rattling or hissing sounds.
  • •Decreased fuel efficiency or engine performance (if applicable).

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

  • •Jack and jack stands or ramps
  • •Socket set and ratchet
  • •Wrenches (various sizes)
  • •Torque wrench
  • •Screwdrivers (flathead and Phillips)
  • •Exhaust system hanger removal tool
  • •Smoke machine (optional for leaks)
  • •Soapy water spray bottle
  • •Safety glasses and gloves

Additional Information

Affected Component
exhaust system
Difficulty
medium
Severity
medium
Tools Required
9 items

Related Faults

Loading...

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation
Tools Required
  • Jack and jack stands or ramps
  • Socket set and ratchet
  • Wrenches (various sizes)
  • Torque wrench
  • Screwdrivers (flathead and Phillips)
  • Exhaust system hanger removal tool
  • Smoke machine (optional for leaks)
  • Soapy water spray bottle
  • Safety glasses and gloves

Repair Instructions

  1. Repair Leaks

    • If any leaks are found, determine the source.
    • Replace damaged gaskets or use high-temperature exhaust sealant as necessary.
    • Tighten any loose connections or bolts to the specified torque.

  2. Replace Damaged Components

    • Muffler Replacement:
      • If the muffler is found to be damaged, remove the old muffler using a socket set.
      • Install the new muffler, ensuring all clamps and hangers are secure.
    • Exhaust Pipe Replacement:
      • For damaged pipes, remove them using appropriate tools. Be cautious of rusted bolts that may require penetrating oil.
      • Install new exhaust pipes, ensuring all connections are tight and properly aligned.
    • Catalytic Converter:
      • If the catalytic converter is causing the noise, consult the vehicle’s manual for proper replacement procedures. This usually involves unbolting and removing the old converter and installing a new one.

  3. Secure Hangers

    • If hangers are damaged or missing, replace them to ensure the exhaust system is secured properly, preventing vibrations that can lead to noise.

  4. Final Check

    • After all repairs are completed, start the engine and check for exhaust noise.
    • Conduct a final visual inspection to ensure there are no leaks.

  5. Test Drive

    • Take the vehicle for a test drive to ensure that the noise issue has been resolved and that the vehicle performs normally.

Conclusion

If after following these steps the loud exhaust noise persists, it may be advisable to consult a professional technician or take the vehicle to a dealership for further diagnosis, as there may be underlying issues that require specialized tools or knowledge.