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

Why does my 2020 Toyota Highlander emit a burning smell?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and repair the burning smell issue in your 2020 Toyota Highlander with our step-by-step guide.

Affected Component
engine, brakes, electrical system

Symptoms

  • •Noticeable burning smell while driving or after the vehicle is parked
  • •Smoke from the engine bay or wheels
  • •Warning lights on the dashboard (e.g., Engine or Brake Light)
  • •Increased engine temperature
  • •Unusual noises (grinding or squealing)

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
  • •OBD-II scanner or temperature gauge
  • •Jack
  • •Jack stands
  • •Lug wrench
  • •Torque wrench
  • •Oil catch pan
  • •Shop towels
  • •Multimeter

Additional Information

Affected Component
engine, brakes, electrical system
Difficulty
medium
Severity
medium
Tools Required
10 items

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Back to Generation
Problem Diagnosis: Burning Smell from 2020 Toyota Highlander
Possible Causes:
  1. Overheated Engine: Coolant leak or malfunctioning thermostat.
  2. Burning Oil: Oil leaking onto hot engine components.
  3. Burning Brake Pads: Brake pads worn out or sticking calipers.
  4. Electrical Short: Wires or connectors overheating.
  5. Debris on Engine Components: Leaves or other debris burning on the exhaust manifold.

Step 1: Visual Inspection

  • Tools Required: Flashlight, gloves.
  • Action:
    1. Open the hood and visually inspect for any signs of leaks (oil, coolant) around engine components.
    2. Check for any debris on the exhaust manifold or around the engine.
    3. Look for any smoke or unusual odors coming from specific components.

Step 2: Check Engine Temperature

  • Tools Required: OBD-II scanner or temperature gauge.
  • Action:
    1. Start the engine and let it warm up.
    2. Monitor the engine temperature; it should remain within the normal operating range (typically 195°F to 220°F).
    3. If the temperature is unusually high, inspect the cooling system for leaks or thermostat issues.

Step 3: Inspect Brake Components

  • Tools Required: Jack, jack stands, lug wrench, torque wrench.
  • Action:
    1. Safely elevate the vehicle using a jack and secure it with jack stands.
    2. Remove the wheels to gain access to the brake components.
    3. Inspect the brake pads for excessive wear and check if the calipers are sticking.
    4. Look for signs of overheating, such as discoloration on the brake rotor.

Step 4: Check for Oil Leaks

  • Tools Required: Oil catch pan, shop towels.
  • Action:
    1. Check the oil level using the dipstick.
    2. If low, inspect for leaks around the oil pan, valve cover gasket, and oil filter.
    3. If oil is leaking onto the engine, clean the area and monitor for new leaks after running the engine.

Step 5: Inspect Electrical Components

  • Tools Required: Multimeter.
  • Action:
    1. With the vehicle off, inspect wiring harnesses and connectors for damage or wear.
    2. Check for melted insulation or burnt connectors.
    3. Use a multimeter to test for shorts or continuity where necessary.
Repair Instructions

Repairing Overheated Engine

  1. If a coolant leak is found:
    • Replace the faulty hose or component.
    • Refill the coolant system and bleed it for air.
  2. If the thermostat is faulty:
    • Drain the coolant.
    • Remove the thermostat housing, replace the thermostat, and reassemble.

Repairing Burning Oil

  1. If there’s an oil leak:
    • Replace the gasket or seal causing the leak.
    • Clean the affected area to prevent further burning.

Repairing Brake Issues

  1. If brake pads are worn:
    • Replace the brake pads and rotors if necessary.
    • Inspect and replace calipers or brake fluid if sticking is noted.

Repairing Electrical Problems

  1. If damaged wiring is found:
    • Replace or repair the damaged wires with appropriate connectors.
    • Ensure all connections are secure and insulated.
Final Steps
  • After performing repairs, start the engine and monitor for any further burning smells or symptoms.
  • Take the vehicle for a test drive under different conditions to ensure the issue is resolved.
  • If the problem persists, consider consulting with a professional mechanic for further diagnostics.
Safety Precautions
  • Always wear safety gloves and goggles while working on your vehicle.
  • Ensure the vehicle is securely supported when elevated.
  • Be cautious of hot engine components and fluids.