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

medium

Severity

3 min read

595 words

Problem Statement

Learn how to diagnose and fix a burning smell in your 2014-2019 Toyota Highlander. 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

•Disconnect the battery before working on electrical systems
•Allow the engine to cool before opening the hood or inspecting components

Symptoms

•Burning smell noticeable inside or outside the vehicle
•Smoke observed from the engine bay or undercarriage
•Check engine light illuminated
•Decreased engine performance
•Unusual noises from the engine or transmission

Diagnostic Steps

1
Inspect for fluid leaks under the vehicle, particularly oil, coolant, or transmission fluid
2
Check the engine oil level and condition; low or burnt oil can cause a burning smell
3
Inspect the transmission fluid level and condition; burnt transmission fluid can emit a burning odor
4
Look for signs of overheating brakes such as worn brake pads or sticking calipers
5
Visually inspect belts and hoses for wear, cracks, or damage that could lead to burning odors
6
Use an OBD-II scanner to check for any stored error codes that may indicate underlying issues

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
•Wrench set
•Jack and jack stands
•Fluid containers
•Rags

Parts Required

•Engine oil
•Transmission fluid
•Brake pads
•Belts and hoses (if needed)

Related Faults

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Diagnostic Steps

1
Inspect for fluid leaks under the vehicle, particularly oil, coolant, or transmission fluid
2
Check the engine oil level and condition; low or burnt oil can cause a burning smell
3
Inspect the transmission fluid level and condition; burnt transmission fluid can emit a burning odor
4
Look for signs of overheating brakes such as worn brake pads or sticking calipers
5
Visually inspect belts and hoses for wear, cracks, or damage that could lead to burning odors
6
Use an OBD-II scanner to check for any stored error codes that may indicate underlying issues

Solution

1. Preparation

Gather Tools: OBD-II scanner, socket set, wrench set, fluid containers, and rags.
Safety Precautions: Ensure the vehicle is parked on a flat surface, engage the parking brake, and allow the engine to cool.

2. Address Fluid Issues

Engine Oil:
1. Remove the oil dipstick and wipe it clean.
2. Insert it back into the tube and remove it again to check the oil level.
3. If low, add the appropriate oil type as specified in the owner's manual.
4. If the oil appears burnt, perform an oil change.
Transmission Fluid:
1. Locate the transmission dipstick (if applicable) and check the fluid level.
2. If low, add the correct transmission fluid type.
3. If burnt, consider a transmission fluid change.

3. Inspect and Replace Brake Components

Remove Wheel: Use a jack to lift the vehicle and remove the wheel to access the brakes.
Inspect Brake Pads: Check the thickness of the brake pads; replace if worn down.
Check Calipers: Ensure calipers are not sticking; clean or replace as necessary.

4. Replace Worn Belts and Hoses

Visual Inspection: Check all engine belts and hoses for cracks or fraying.
Replace as Needed: Remove damaged components using the socket set and install new ones, ensuring proper tension.

5. Clean Engine Components

Engine Bay Cleaning: Use a degreaser to clean any oil buildup in the engine bay that could be causing a burning smell.
Inspect for Residue: After cleaning, check for any remaining leaks or sources of burning odors.