my Toyota Highlander Third Generation (2014-2019) has a burning smell when driving

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

560 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 diagnostic procedures 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 inspecting or working on it to prevent burns.

Symptoms

•Burning smell noticeable inside or outside the vehicle
•Possible smoke from the engine bay or undercarriage
•Overheating engine temperature gauge
•Soft or spongy brake pedal feel
•Reduced braking performance

Diagnostic Steps

1
Inspect for fluid leaks under the vehicle and around the engine compartment.
2
Check the engine oil level and condition; look for burnt oil odor.
3
Scan the vehicle for trouble codes using an OBD-II scanner.
4
Inspect the brake system, including brake pads, rotors, and calipers.
5
Examine the transmission fluid level and condition.
6
Check for any electrical components overheating or damaged wiring.

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
•Jack
•Jack stands
•Lug wrench
•Brake pad spreader
•Transmission fluid funnel
•Wire cutters
•Wire strippers

Parts Required

•Engine oil
•Oil filter
•Brake pads
•Rotors (if necessary)
•Transmission fluid
•Electrical connectors
•Wiring harness (if necessary)

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Diagnostic Steps

1
Inspect for fluid leaks under the vehicle and around the engine compartment.
2
Check the engine oil level and condition; look for burnt oil odor.
3
Scan the vehicle for trouble codes using an OBD-II scanner.
4
Inspect the brake system, including brake pads, rotors, and calipers.
5
Examine the transmission fluid level and condition.
6
Check for any electrical components overheating or damaged wiring.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a flat surface and engage the parking brake.
Disconnect the battery to ensure safety while working with electrical components.

2. Check Engine Oil

Remove the engine oil dipstick and check the oil level; add oil if it's low.
Inspect the oil for a burnt smell and dark color; if burnt, change the oil and filter.
- Tools Required: Oil filter wrench, oil catch pan, socket set.
- Parts Required: Engine oil, oil filter.

3. Inspect Brake System

Lift the vehicle using a jack and secure it with jack stands.
Remove the wheel to access the brake components.
Check brake pads and rotors for wear; replace if they are worn down.
- Tools Required: Jack, jack stands, lug wrench, brake pad spreader.
- Parts Required: Brake pads, rotors (if necessary).

4. Check Transmission Fluid

Locate the transmission fluid dipstick; pull it out and check the fluid level.
If the fluid is low or burnt, drain and replace the fluid.
- Tools Required: Transmission fluid funnel, oil catch pan, socket set.
- Parts Required: Transmission fluid.

5. Inspect Electrical Components

Visually check wiring and connectors for signs of melting or burning.
Replace any damaged wiring or connectors.
- Tools Required: Wire cutters, wire strippers, electrical tape.
- Parts Required: Electrical connectors, wiring harness (if necessary).