why does my Toyota Highlander Fourth Generation (2020-present) have a burning smell after driving

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

557 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 the burning smell after driving in a 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

Symptoms

•Burning smell noticeable after driving
•Potential smoke from under the hood or wheel wells
•Overheating engine warning light illuminated
•Unusual noise from the engine or brakes
•Decreased braking performance or spongy brake pedal

Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Check fluid levels (engine oil, transmission fluid, coolant, brake fluid) to ensure they are within specifications
3
Inspect the engine compartment visually for any signs of leaks, burnt wiring, or fluid accumulation
4
Examine brake components for wear, including pads, rotors, and calipers for signs of overheating or damage
5
Test drive the vehicle while monitoring engine temperature and brake function to replicate the burning smell
6
Inspect the exhaust system for any signs of leaks or damage that could cause unusual odors

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
•Jack stands
•Brake cleaner
•Rags

Parts Required

•Engine oil
•Oil filter
•Brake pads
•Brake rotors
•Transmission fluid
•Gaskets (if necessary)

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Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Check fluid levels (engine oil, transmission fluid, coolant, brake fluid) to ensure they are within specifications
3
Inspect the engine compartment visually for any signs of leaks, burnt wiring, or fluid accumulation
4
Examine brake components for wear, including pads, rotors, and calipers for signs of overheating or damage
5
Test drive the vehicle while monitoring engine temperature and brake function to replicate the burning smell
6
Inspect the exhaust system for any signs of leaks or damage that could cause unusual odors

Solution

1. Preparation

Tools Needed: OBD-II scanner, socket set, jack, jack stands, brake cleaner, rags.
Safety Warning: Disconnect the battery before working on electrical systems and allow the engine to cool before opening the hood.

2. Addressing Engine Issues

Check and replace any leaking gaskets:
- Remove the engine cover (if applicable) using a socket set.
- Inspect valve cover gaskets and oil pan gaskets for leaks; replace if necessary.
Change engine oil and filter:
- Drain the old oil by removing the oil drain plug.
- Replace the oil filter and refill with manufacturer-recommended engine oil.

3. Brake System Inspection

Inspect and replace brake pads and rotors if needed:
- Lift the vehicle using a jack and secure with jack stands.
- Remove the wheel to access brake components.
- Measure pad thickness; replace if below manufacturer specifications.
- Inspect rotors for scoring or warping; replace if necessary.

4. Transmission Fluid Check

Inspect transmission fluid:
- Check the transmission dipstick for the fluid level and condition.
- If burnt or low, drain and replace with the correct type of transmission fluid.

5. Exhaust System Repair

Inspect and repair exhaust components:
- Look for any cracks or holes in the exhaust pipes or muffler.
- Use exhaust tape or replace damaged sections as needed.