why does my Toyota Highlander Third Generation (2014-2019) have a burning smell when driving

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

476 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix a burning smell in your Toyota Highlander 2014-2019. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the hood or checking fluids to avoid burns.

Symptoms

•Burning smell noticeable inside or outside the vehicle
•Smoke coming from the engine compartment or undercarriage
•Overheating temperature gauge reading
•Check engine light illuminated
•Unusual noises from the engine or braking system

Diagnostic Steps

1
Inspect the engine bay for any signs of leaking fluids, such as oil or coolant.
2
Check the brake components for wear, including the pads and rotors, as overheating brakes can emit a burning smell.
3
Scan the vehicle's OBD-II system for any error codes related to engine or transmission issues.
4
Examine the belts and hoses for signs of wear or damage that could cause them to overheat.
5
Check the transmission fluid level and condition, as burnt transmission fluid can cause a burning smell.
6
Monitor the temperature gauge while driving to identify any overheating conditions.

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
•Socket set
•Torque wrench
•Brake pad spreader
•Fluid pump (for transmission fluid)

Parts Required

•Brake pads
•Brake rotors (if worn)
•Transmission fluid
•Engine oil (if leaking)

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Diagnostic Steps

1
Inspect the engine bay for any signs of leaking fluids, such as oil or coolant.
2
Check the brake components for wear, including the pads and rotors, as overheating brakes can emit a burning smell.
3
Scan the vehicle's OBD-II system for any error codes related to engine or transmission issues.
4
Examine the belts and hoses for signs of wear or damage that could cause them to overheat.
5
Check the transmission fluid level and condition, as burnt transmission fluid can cause a burning smell.
6
Monitor the temperature gauge while driving to identify any overheating conditions.

Solution

1. Preparation

Ensure the vehicle is parked on a flat surface, and the engine is off.
Gather necessary tools and parts.
Allow the engine to cool to avoid burns.

2. Inspect and Repair Leaks

Sub-steps:
1. Open the hood and visually inspect for oil or coolant leaks.
2. Clean any spilled fluids with a rag.
3. Replace any worn gaskets or seals that are leaking.

3. Check and Replace Brake Components

Sub-steps:
1. Remove the wheel to access the brake assembly.
2. Inspect the brake pads and rotors for excessive wear.
3. Replace worn brake pads and resurfacing or replacing rotors as necessary.
4. Reinstall the wheel and lower the vehicle.

4. Replace Worn Belts and Hoses

Sub-steps:
1. Inspect serpentine belts and coolant hoses for cracks or fraying.
2. Remove and replace any damaged belts or hoses.
3. Ensure all connections are tight and secure.

5. Check Transmission Fluid

Sub-steps:
1. Locate the transmission dipstick and remove it to check fluid level.
2. If low, add the appropriate type of transmission fluid until it reaches the correct level.
3. If fluid is burnt or discolored, perform a transmission fluid change.

6. Final Checks

Sub-steps:
1. Start the engine and check for any leaks.
2. Take the vehicle for a short test drive to ensure the burning smell is no longer present.

Tools Required:

OBD-II scanner
Socket set
Torque wrench
Brake pad spreader
Fluid pump (for transmission fluid)

Parts Required:

Brake pads
Brake rotors (if worn)
Transmission fluid
Engine oil (if leaking)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on electrical systems.
Allow the engine to cool before opening the hood or checking fluids to avoid burns.