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

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

581 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

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Allow the engine to cool before performing any inspections or repairs.
•Disconnect the battery before working on electrical systems to prevent shocks.

Symptoms

•Burning odor inside or outside the vehicle
•Smoke visible from the engine compartment or undercarriage
•Engine overheating warning light illuminated
•Decreased engine performance or power loss
•Unusual noises from the engine or transmission area

Diagnostic Steps

1
Inspect the engine bay for any visible signs of leaks or burnt components.
2
Check the engine oil level and condition; look for signs of burning or contamination.
3
Examine the transmission fluid level and condition; assess for burnt smell or discoloration.
4
Scan the vehicle’s onboard computer for any diagnostic trouble codes (DTCs).
5
Inspect the brake system, including brake pads and rotors, for excessive wear or overheating.
6
Look for any signs of electrical issues, such as damaged wiring or burnt connectors.

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
•Oil filter wrench
•Socket set
•Torque wrench
•Drain pan

Parts Required

•Engine oil (0W-20 or 5W-20)
•Oil filter
•Transmission fluid (ATF WS)
•Brake pads and rotors (if needed)

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Diagnostic Steps

1
Inspect the engine bay for any visible signs of leaks or burnt components.
2
Check the engine oil level and condition; look for signs of burning or contamination.
3
Examine the transmission fluid level and condition; assess for burnt smell or discoloration.
4
Scan the vehicle’s onboard computer for any diagnostic trouble codes (DTCs).
5
Inspect the brake system, including brake pads and rotors, for excessive wear or overheating.
6
Look for any signs of electrical issues, such as damaged wiring or burnt connectors.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface with the engine off and cool.
Disconnect the negative battery terminal to prevent any electrical hazards.

2. Inspect Engine Oil and Replace if Necessary

Remove the engine oil dipstick and check the oil level and condition.
If the oil is low or burnt, proceed to drain the old oil using an oil drain pan.
Replace the oil filter using an oil filter wrench.
Refill the engine with the manufacturer-recommended oil type (typically 0W-20 or 5W-20) using a funnel.
Reconnect the negative battery terminal.

3. Check and Replace Transmission Fluid if Necessary

Locate the transmission dipstick and pull it out to check the fluid level and condition.
If fluid is low or burnt, drain the transmission fluid using a drain pan.
Replace the transmission filter if applicable.
Refill with the manufacturer-recommended transmission fluid (usually ATF WS) through the dipstick tube.

4. Inspect and Replace Brake Components

Remove the wheel to access the brake assembly.
Inspect brake pads for wear; replace if they are worn past the replacement indicator.
Check brake rotors for signs of overheating; replace if warped or damaged.
Reassemble the wheel and lower the vehicle.

5. Inspect Electrical Components

Visually inspect all wiring and connectors in the engine bay for any signs of damage or burns.
Repair or replace any damaged wiring as needed.
Ensure all connections are secure.