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What are the common problems with the Toyota Highlander’s exhaust system from 2020? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What are the common problems with the Toyota Highlander’s exhaust system from 2020?

What are the common problems with the Toyota Highlander’s exhaust system from 2020?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
696 words

Problem Statement

Explore common exhaust system issues in the 2020 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Affected Component
exhaust system

Symptoms

  • •Hissing or popping sounds from the exhaust area
  • •Noticeable odor of exhaust fumes
  • •Reduced engine performance
  • •Loud rumbling noises
  • •Vibrations or rattling sounds
  • •Visible rust or damage under the vehicle
  • •Check Engine Light illuminated
  • •Poor fuel economy
  • •Increased emissions
  • •Rough idle or stalling
  • •Loss of power during acceleration
  • •Rattling noise from the converter area
  • •Excessive movement of the exhaust system
  • •Clanging noises during operation
  • •Visible misalignment of exhaust components

Diagnostic Steps

  1. 1
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  5. 5
  6. 6

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
  • •Jack and Jack Stands
  • •Safety Glasses
  • •Mechanic's Creeper
  • •Multimeter
  • •Smoke Machine (for exhaust leaks)
  • •Soapy Water Solution
  • •Wrenches and Sockets (various sizes)
  • •Replacement Parts (as needed)
  • •Torque Wrench

Additional Information

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

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Back to Generation
Common Exhaust System Problems with the 2020 Toyota Highlander

The 2020 Toyota Highlander, part of the fourth generation (XU70), may experience various exhaust system issues. Here are some common problems, their symptoms, diagnostic steps, tools required, and repair instructions.

Common Problems and Symptoms

  1. Exhaust Leaks

    • Symptoms: Hissing or popping sounds from the exhaust area, noticeable odor of exhaust fumes, reduced engine performance.

  2. Damaged or Rusted Exhaust Components

    • Symptoms: Loud rumbling noises, vibrations, or rattling sounds, visible rust or damage under the vehicle.

  3. Faulty Oxygen Sensors

    • Symptoms: Check Engine Light illuminated, poor fuel economy, increased emissions, rough idle or stalling.

  4. Catalytic Converter Issues

    • Symptoms: Loss of power during acceleration, rattling noise from the converter area, Check Engine Light indicating catalytic converter inefficiency.

  5. Exhaust Hangar Failure

    • Symptoms: Excessive movement of the exhaust system, clanging noises during operation, visible misalignment of exhaust components.
Tools Required
  • OBD-II Scanner
  • Jack and Jack Stands
  • Safety Glasses
  • Mechanic's Creeper
  • Multimeter
  • Smoke Machine (for exhaust leaks)
  • Soapy Water Solution
  • Wrenches and Sockets (various sizes)
  • Replacement Parts (as needed)
  • Torque Wrench
Repair Instructions

1. Repairing Exhaust Leaks

  • Step 1: Identify the leak source using the smoke machine or soapy water method.
  • Step 2: For minor leaks, apply exhaust tape or sealant. For larger issues, replace the affected section of the exhaust pipe.
  • Step 3: Reattach any loose components securely using the appropriate fasteners.

2. Replacing Damaged Exhaust Components

  • Step 1: Raise the vehicle using a jack and secure it with jack stands.
  • Step 2: Remove the damaged exhaust component (pipe, muffler, etc.) using wrenches and sockets.
  • Step 3: Install the new component, ensuring proper alignment and secure fastening.
  • Step 4: Double-check for leaks and ensure all hangars are properly attached.

3. Replacing Faulty Oxygen Sensors

  • Step 1: Locate the oxygen sensors (usually before and after the catalytic converter).
  • Step 2: Disconnect the wiring harness and remove the sensor using an oxygen sensor socket.
  • Step 3: Install the new sensor, making sure to apply anti-seize compound on the threads.
  • Step 4: Reconnect the wiring harness and clear any stored codes from the OBD-II scanner.

4. Replacing the Catalytic Converter

  • Step 1: Raise the vehicle and remove any heat shields or supports obstructing access.
  • Step 2: Unbolt the catalytic converter from the exhaust system, ensuring you don't damage surrounding components.
  • Step 3: Install the new catalytic converter and reattach any supports or heat shields.
  • Step 4: Start the engine and check for leaks.

5. Replacing Exhaust Hangars

  • Step 1: Inspect hangars for wear or damage.
  • Step 2: Remove the old hangars and install new ones, ensuring they fit securely.
  • Step 3: Adjust the exhaust system as needed to ensure proper alignment.
Conclusion

While the 2020 Toyota Highlander has a well-engineered exhaust system, it is not immune to common issues that can arise over time. Regular inspections and prompt repairs can help maintain optimal performance and emissions control. Always refer to the vehicle's service manual for specific torque specifications and repair procedures tailored to your model.