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Why does my 2021 Highlander have a burning smell? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/Why does my 2021 Highlander have a burning smell?

Why does my 2021 Highlander have a burning smell?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and repair the burning smell issue in your 2021 Toyota Highlander with detailed symptoms, diagnostic steps, and repair instructions.

Affected Component
engine, electrical system, brakes, transmission
Estimated Time
2-4 hours

Symptoms

  • •Burning smell
  • •Check engine light
  • •Smoke
  • •Unusual noises
  • •Poor performance

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

  • •Flashlight
  • •gloves
  • •safety goggles
  • •Shop towels
  • •oil catch pan
  • •Jack
  • •jack stands
  • •lug wrench
  • •Multimeter
  • •OBD-II scanner
  • •Wrench set
  • •oil filter wrench
  • •engine oil
  • •Brake cleaner
  • •new brake pads and rotors
  • •torque wrench
  • •Electrical tape
  • •wire connectors
  • •soldering iron
  • •Coolant
  • •radiator sealant
  • •funnel

Additional Information

Affected Component
engine, electrical system, brakes, transmission
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
22 items

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Back to Generation

If your 2021 Toyota Highlander is exhibiting a burning smell, it's essential to diagnose the issue promptly to avoid potential damage or safety hazards. Below are detailed steps to identify the cause, diagnostic methods, and repair instructions.

Potential Causes
  1. Oil Leak: Engine oil leaks could drip onto hot engine components.
  2. Electrical Issues: Short circuits or damaged wiring may produce a burning smell.
  3. Brake Problems: Overheating brakes can emit a burning odor.
  4. Coolant Leak: Leaking coolant may burn off on hot engine parts.
  5. Clutch or Transmission Issues: If applicable, slipping clutch or overheating transmission fluid.

1. Initial Inspection

  • Tools Required: Flashlight, gloves, and safety goggles.
  • Action:
    • Park the vehicle on a flat surface and turn off the engine.
    • Open the hood and visually inspect for signs of oil leaks, burnt wiring, or any fluid pooling.
    • Check around the tires and brake assemblies for signs of overheating or burning brake pads.

2. Check for Leaks

  • Tools Required: Shop towels, oil catch pan.
  • Action:
    • Use a flashlight to inspect the engine bay and under the vehicle for oil, coolant, or transmission fluid leaks.
    • Wipe any suspected areas and check for fresh fluid on the towels.

3. Inspect Brake Components

  • Tools Required: Jack, jack stands, lug wrench, and safety gloves.
  • Action:
    • Lift the vehicle using a jack and secure it with jack stands.
    • Remove the front and rear wheels to inspect brake pads and rotors.
    • Look for signs of excessive wear, burning, or discoloration on the pads and rotors.

4. Electrical System Check

  • Tools Required: Multimeter, wiring diagram (if needed).
  • Action:
    • Inspect the wiring harnesses and connections for signs of melting or burning.
    • Use a multimeter to ensure there are no shorts in the electrical system.

5. Engine and Transmission Inspection

  • Tools Required: OBD-II scanner.
  • Action:
    • Connect an OBD-II scanner to check for any diagnostic trouble codes (DTCs).
    • Pay attention to any codes related to the engine, transmission, or overheating.
Repair Instructions

1. Oil Leak Repair

  • Tools Required: Wrench set, oil filter wrench, engine oil.
  • Action:
    • Replace any leaking gaskets or seals identified during inspection.
    • If necessary, change the oil filter and refill the engine with the correct oil type.

2. Brake Component Replacement

  • Tools Required: Brake cleaner, new brake pads and rotors, torque wrench.
  • Action:
    • If brake pads or rotors are damaged, replace them with the appropriate parts.
    • Clean the brake components with brake cleaner.
    • Reassemble and torque the lug nuts to manufacturer specifications.

3. Electrical Repair

  • Tools Required: Electrical tape, wire connectors, soldering iron (if needed).
  • Action:
    • Repair any damaged wiring by either replacing the affected section or using wire connectors and electrical tape to insulate it.
    • Test the electrical system again to ensure there are no further issues.

4. Addressing Coolant Leaks

  • Tools Required: Coolant, radiator sealant (optional).
  • Action:
    • Replace any damaged hoses or components identified as leaking.
    • Refill the cooling system with the appropriate coolant mixture.

5. Transmission Inspection

  • Tools Required: Transmission fluid, funnel, and a torque wrench.
  • Action:
    • If transmission fluid is low, top it off with the correct type of fluid.
    • If the fluid is burnt or contaminated, consider a fluid change and filter replacement.
Conclusion

After completing these diagnostic steps and repairs, take the vehicle for a test drive, monitoring for any return of the burning smell. If the issue persists, it may be necessary to consult a professional technician or dealership for further diagnosis. Always prioritize safety and ensure the vehicle is off and cooled down before starting any inspections or repairs.