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Why does my 2020 Highlander emit strange smells while driving? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/Why does my 2020 Highlander emit strange smells while driving?

Why does my 2020 Highlander emit strange smells while driving?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and fix unusual smells in your 2020 Toyota Highlander with our step-by-step guide.

Affected Component
Cooling system, exhaust system, cabin air filter
Estimated Time
2-4 hours

Symptoms

  • •Emission of strange odors inside or outside the vehicle while driving
  • •Possible odors include burning rubber, burnt oil, coolant, or a sweet smell reminiscent of antifreeze
  • •Smells may vary depending on driving conditions

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

  • •Basic hand tools (screwdrivers, wrenches)
  • •Flashlight
  • •Engine oil dipstick
  • •Inspection mirror
  • •Jack and jack stands
  • •OBD-II scanner

Additional Information

Affected Component
Cooling system, exhaust system, cabin air filter
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
6 items

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Back to Generation
Issue: Unusual Smells While Driving a 2020 Toyota Highlander

Symptoms:

  • Emission of strange odors inside or outside the vehicle while driving.
  • Possible odors include burning rubber, burnt oil, coolant, or a sweet smell reminiscent of antifreeze.
  • Smells may vary depending on driving conditions (e.g., acceleration, idling, or after parking).
Tools Required
  • Basic hand tools (screwdrivers, wrenches)
  • Flashlight
  • Engine oil dipstick
  • Inspection mirror
  • Jack and jack stands (if needed for undercarriage inspection)
  • OBD-II scanner (for checking engine codes)
Repair Instructions

Step 1: Inspect for Leaks

  1. Engine Oil Check:

    • Use the dipstick to check oil levels. If low, top off with the appropriate oil and check for leaks.

  2. Coolant Level Check:

    • Check the coolant reservoir for proper levels. If low, inspect hoses and fittings for leaks.

  3. Belt Inspection:

    • Visually inspect the serpentine belt and other belts for fraying or wear. Replace any damaged belts.

Step 2: Cabin Air Filter Replacement

  1. Locate the Cabin Air Filter:

    • Open the glove compartment and remove it to access the cabin air filter compartment.

  2. Remove the Old Filter:

    • Take out the old filter, noting its orientation for proper installation of the new filter.

  3. Install New Filter:

    • Insert the new filter, ensuring it is oriented correctly as per the markings on the filter housing.

Step 3: Exhaust System Inspection

  1. Visual Inspection:

    • Look for any rust, holes, or loose connections in the exhaust pipes and muffler.

  2. Check Catalytic Converter:

    • If you smell a rotten egg odor, the catalytic converter may be failing and should be diagnosed further or replaced.

Step 4: Engine Cooling System Check

  1. Pressure Test:

    • Use a cooling system pressure tester to check for leaks in the radiator and hoses.

  2. Thermostat Functionality:

    • Ensure the thermostat opens and closes properly. Replace if malfunctioning.

Step 5: Road Test

  1. Test Drive:

    • After completing the repairs, take the vehicle for a test drive under various conditions to confirm the smell has resolved.

  2. Monitor for Recurrence:

    • Pay attention to any smells returning and check for new symptoms.
Conclusion

If the smell persists after following these diagnostic and repair steps, or if you identify any significant issues, it may be advisable to consult with a professional technician for further diagnosis and repair. Regular maintenance and timely repairs will help prevent these issues from occurring in the future.