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

501 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 burning smell issues in 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 battery before working on electrical systems.
•Allow engine to cool before opening the hood or checking fluids.

Symptoms

•Burning smell noticeable inside or outside the vehicle
•Possible smoke from under the hood or near the wheels
•Engine overheating or temperature gauge rising
•Reduced braking efficiency or grinding noise during braking
•Fluid leaks on the ground beneath the vehicle

Diagnostic Steps

1
Inspect for leaks by checking for any visible oil, coolant, or transmission fluid leaks under the vehicle.
2
Check engine temperature by monitoring the engine temperature gauge for any abnormal readings during operation.
3
Scan for error codes using an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to engine or transmission issues.
4
Inspect brake components by examining brake pads, rotors, and calipers for signs of wear or overheating.
5
Examine belts and hoses by visually inspecting them for fraying or melting, which could cause a burning smell.
6
Check transmission fluid by inspecting the transmission fluid level and condition; burnt fluid could indicate internal transmission problems.

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
•Jack and jack stands
•Multimeter
•Torque wrench

Parts Required

•Brake pads and rotors (if worn)
•Gaskets or seals (if leaking)
•Transmission fluid

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Diagnostic Steps

1
Inspect for leaks by checking for any visible oil, coolant, or transmission fluid leaks under the vehicle.
2
Check engine temperature by monitoring the engine temperature gauge for any abnormal readings during operation.
3
Scan for error codes using an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to engine or transmission issues.
4
Inspect brake components by examining brake pads, rotors, and calipers for signs of wear or overheating.
5
Examine belts and hoses by visually inspecting them for fraying or melting, which could cause a burning smell.
6
Check transmission fluid by inspecting the transmission fluid level and condition; burnt fluid could indicate internal transmission problems.

Solution

1. Preparation

Gather tools and parts needed.
Disconnect the battery to prevent electrical shorts.
Allow the engine to cool down to avoid burns.

2. Addressing Fluid Leaks

Inspect and Repair Leaks:
- Identify the source of any fluid leaks.
- Replace gaskets, seals, or components that are leaking.
- Top off any lost fluids to proper levels.

3. Brake Inspection and Repair

Remove Wheel Assembly:
- Jack up the vehicle and remove the wheel using a socket set.
- Support the vehicle securely with jack stands.
Inspect Brake Components:
- Check brake pads and rotors for wear; replace if necessary.
- Lubricate brake caliper slides and install new brake pads.
Reassemble:
- Reinstall the wheel and torque to manufacturer specifications.

4. Engine and Transmission Checks

Inspect Belts and Hoses:
- Replace any frayed or damaged belts and hoses.
Change Transmission Fluid:
- Drain old transmission fluid and replace it with new fluid of the correct type (refer to the owner’s manual for specifications).
- Replace the transmission filter if equipped.