Why is there a smell of burning oil in my 2021 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

medium

Difficulty

medium

Severity

4 min read

649 words

Problem Statement

Learn how to diagnose and repair the burning oil smell in your 2021 Toyota Highlander with our step-by-step guide.

Affected Component

engine

Symptoms

•A noticeable burning oil smell, especially after the engine has been running for a while.
•Possible visible smoke from the engine compartment or under the vehicle.
•Oil spots or puddles under the vehicle after it has been parked.

Diagnostic Steps

1
Open the hood and inspect for any visible oil leaks around the valve cover, oil filter, and oil pan.
2
Check the condition of the oil filler cap to ensure it's secure and not damaged.
3
Use the dipstick to check the oil level. If it’s low, it may indicate a leak or excessive consumption.
4
Examine the valve cover gasket for any signs of oil seeping out.
5
Look for oil around the oil pan gasket and any other seals that may be failing.
6
Check for oil leaks that may be dripping onto hot exhaust components, which can cause a burning smell.
7
Inspect the area around the turbocharger (if equipped) for oil leaks.
8
Inspect the Positive Crankcase Ventilation (PCV) valve and hoses for blockages or leaks.
9
Use a clean cloth to wipe down any suspected areas. Look for fresh oil on the surfaces.

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

•Socket set (metric)
•Torque wrench
•Screwdriver set
•Oil catch pan
•Clean rags or shop towels
•Oil pressure gauge (optional)
•Flashlight or work light

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Diagnostic Steps

1
Open the hood and inspect for any visible oil leaks around the valve cover, oil filter, and oil pan.
2
Check the condition of the oil filler cap to ensure it's secure and not damaged.
3
Use the dipstick to check the oil level. If it’s low, it may indicate a leak or excessive consumption.
4
Examine the valve cover gasket for any signs of oil seeping out.
5
Look for oil around the oil pan gasket and any other seals that may be failing.
6
Check for oil leaks that may be dripping onto hot exhaust components, which can cause a burning smell.
7
Inspect the area around the turbocharger (if equipped) for oil leaks.
8
Inspect the Positive Crankcase Ventilation (PCV) valve and hoses for blockages or leaks.
9
Use a clean cloth to wipe down any suspected areas. Look for fresh oil on the surfaces.

Solution

Problem: Smell of Burning Oil in 2021 Toyota Highlander

Tools Required

Socket set (metric)
Torque wrench
Screwdriver set
Oil catch pan
Clean rags or shop towels
Oil pressure gauge (optional)
Flashlight or work light

Repair Instructions

Step 1: Addressing Oil Leaks

Replace Valve Cover Gasket (if leaking):
- Remove any plastic engine covers if applicable.
- Disconnect wiring harnesses or components blocking access to the valve cover.
- Unscrew the valve cover bolts using the socket set. Keep track of their positions.
- Carefully lift the valve cover, ensuring not to damage any surrounding components.
- Clean the mating surfaces of the engine and valve cover thoroughly.
- Install a new valve cover gasket and torque the bolts to the manufacturer specifications (usually around 7-10 ft-lbs).
Replace Oil Filter (if leaking):
- If the oil filter is the source of the leak, use an oil filter wrench to remove it.
- Apply a small amount of new oil to the rubber O-ring on the new oil filter.
- Install the new oil filter hand-tight.
Repair or Replace Oil Pan Gasket:
- If the oil pan gasket is leaking, drain the engine oil into the catch pan.
- Remove the oil pan bolts and carefully remove the oil pan.
- Clean the old gasket material off the oil pan and engine block.
- Install a new gasket and reattach the oil pan, torqueing the bolts to specifications.

Step 2: Inspect and Replace PCV System Components

Replace the PCV Valve:
- Locate the PCV valve (usually on the valve cover or intake manifold).
- Remove the PCV valve by twisting or pulling it out, depending on your model.
- Install the new PCV valve by reversing the removal steps.

Step 3: Final Checks

Refill Engine Oil:
- Refill the engine oil using the correct specification oil (5W-30 or as specified in the owner’s manual).
- Start the engine and let it run for a few minutes while checking for leaks around the repaired areas.
Test Drive:
- Take the vehicle for a short test drive and monitor for any burning oil smells or leaks.

Conclusion

If after performing these inspections and repairs the burning oil smell persists, it may indicate more severe issues such as internal engine problems or other hidden leaks. In such cases, further diagnostics or consultation with a professional mechanic may be necessary.