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

Why does my 2021 Highlander have a burning smell coming from the engine?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and fix the burning smell issue in your 2021 Toyota Highlander with these detailed steps and required tools.

Affected Component
engine

Symptoms

  • •Burning Smell
  • •Smoke
  • •Engine Temperature
  • •Warning Lights

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

  • •Safety gloves and glasses
  • •Torque wrench
  • •Socket set (including metric sizes)
  • •Screwdriver set
  • •Flashlight
  • •OBD-II scanner (optional for checking codes)
  • •Oil catch pan
  • •Rags for cleaning

Additional Information

Affected Component
engine
Difficulty
medium
Severity
medium
Tools Required
8 items

Related Faults

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Back to Generation

Possible Causes:

  1. Oil Leak: Oil may be leaking onto hot engine components.
  2. Coolant Leak: Coolant may be leaking onto the engine or exhaust.
  3. Belt Issues: A worn or slipping serpentine belt can produce a burning rubber smell.
  4. Electrical Issues: Wiring or connectors may be overheating.
  5. Clutch or Transmission Problems: If the smell is more pronounced when driving, it could be related to the transmission.
Tools Required:
  • Safety gloves and glasses
  • Torque wrench
  • Socket set (including metric sizes)
  • Screwdriver set
  • Flashlight
  • OBD-II scanner (optional for checking codes)
  • Oil catch pan
  • Rags for cleaning
Repair Instructions:

Step 1: Address Oil Leaks

  1. Locate the Source: If oil is found leaking, clean the area with rags to pinpoint the source of the leak.
  2. Tighten or Replace Gaskets: If the leak is from a gasket, tighten it or replace it if necessary (e.g., valve cover gasket).
  3. Change Oil Filter: If the oil filter is the source, replace it and ensure that it is installed correctly.

Step 2: Fix Coolant Leaks

  1. Inspect Hoses: Check hoses for cracks or loose clamps; replace any damaged hoses.
  2. Replace Gaskets: If the leak is from the head gasket or water pump, consider replacing the faulty component.

Step 3: Replace or Adjust Serpentine Belt

  1. Remove the Belt: Use a socket to relieve tension on the belt tensioner and slide the belt off.
  2. Inspect and Replace: If defective, replace with a new serpentine belt, ensuring proper routing.

Step 4: Electrical Issues

  1. Inspect Wiring: Look for frayed or melted wires near the engine.
  2. Repair or Replace: If any wiring is damaged, repair with electrical tape or replace the wiring harness as necessary.

Step 5: Professional Assistance

  • If the source of the burning smell cannot be identified or if it relates to the transmission, seek assistance from a certified Toyota technician.
Final Note:

After completing repairs, take the vehicle for a test drive to ensure the burning smell is resolved. If the issue persists, further diagnostic testing may be necessary to check for deeper mechanical or electrical problems. Regular maintenance checks are recommended to prevent future occurrences.