Why does my 2020 Toyota Highlander have a burning smell coming from the engine?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

592 words

Problem Statement

Learn how to diagnose and repair a burning smell coming from the engine of your 2020 Toyota Highlander with our detailed guide.

Affected Component

engine

Estimated Time

2-4 hours

Symptoms

•Noticeable burning smell emanating from under the hood.
•Engine overheating (temperature gauge may rise).
•Smoke visible from the engine compartment.
•Warning lights on the dashboard (e.g., engine light or oil pressure light).

Diagnostic Steps

1
Open the hood and visually check for any obvious signs of leaks or burnt components.
2
Check the engine oil level using the dipstick.
3
Inspect the coolant reservoir to ensure it’s filled to the appropriate level.
4
Place a clean piece of cardboard or a catch pan under the engine and look for oil or coolant leaks.
5
Look for signs of exhaust leaks or burnt wiring near the exhaust manifold.
6
Listen for any unusual sounds when the engine is running.
7
Use an OBD-II scanner to check for any stored trouble codes.

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

•Basic hand tools (wrenches, sockets, screwdrivers)
•OBD-II scanner
•Flashlight
•Engine oil (if low)
•Coolant (if low)
•Clean rags or paper towels
•Cardboard or catch pan for leak detection

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Diagnostic Steps

1
Open the hood and visually check for any obvious signs of leaks or burnt components.
2
Check the engine oil level using the dipstick.
3
Inspect the coolant reservoir to ensure it’s filled to the appropriate level.
4
Place a clean piece of cardboard or a catch pan under the engine and look for oil or coolant leaks.
5
Look for signs of exhaust leaks or burnt wiring near the exhaust manifold.
6
Listen for any unusual sounds when the engine is running.
7
Use an OBD-II scanner to check for any stored trouble codes.

Solution

Problem: Burning Smell from the Engine in a 2020 Toyota Highlander

Symptoms:

Noticeable burning smell emanating from under the hood.
Possible accompanying symptoms may include:
- Engine overheating (temperature gauge may rise).
- Smoke visible from the engine compartment.
- Warning lights on the dashboard (e.g., engine light or oil pressure light).

Tools Required

Basic hand tools (wrenches, sockets, screwdrivers)
OBD-II scanner
Flashlight
Engine oil (if low)
Coolant (if low)
Clean rags or paper towels
Cardboard or catch pan for leak detection

Repair Instructions

Step 1: Address Fluid Leaks

If you’ve identified a leak (e.g., from the oil filter or valve cover gasket), replace the faulty component.
- For oil leaks:
  - Remove old oil filter and install a new one, ensuring the rubber O-ring is lubricated and seated properly.
  - Replace the valve cover gasket if leaking. Remove the valve cover, clean surfaces, and install the new gasket. Torque to manufacturer specifications.

Step 2: Check and Top Off Fluids

If the engine oil or coolant is low:
- Add the appropriate type of engine oil (refer to your owner’s manual for specifications).
- Top off the coolant using a 50/50 mixture of distilled water and coolant.

Step 3: Inspect and Replace Worn Belts or Hoses

If any belts or hoses are frayed or damaged:
- Remove the old belt/hoses and replace them with new ones.
- Ensure proper tension on belts and check for correct routing.

Step 4: Examine the Exhaust System

If there’s evidence of exhaust leaks:
- Tighten any loose connections or replace gaskets as necessary.
- If the catalytic converter is suspected to be the issue, consult a professional for a thorough examination.

Step 5: Clear DTCs and Test Drive

After addressing any issues, clear any diagnostic trouble codes using the OBD-II scanner.
Start the engine and allow it to idle, then take a short test drive to verify that the burning smell has dissipated and that the vehicle is running smoothly.

Conclusion

If the burning smell persists after these repairs, it’s advisable to consult a professional technician for further diagnosis. Persistent smells can indicate underlying issues that may require specialized equipment or expertise.