why does my Toyota Highlander Third Generation (2014-2019) smell like burning oil

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

596 words

Problem Statement

Learn how to diagnose and fix the burning oil smell in your Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostics, 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 working on components.

Symptoms

•Burning oil smell, especially after driving
•Oil spots or puddles under the vehicle
•Decreased oil level on the dipstick
•Engine overheating or high temperature readings
•Check engine light illuminated or oil pressure warning light on

Diagnostic Steps

1
Inspect the engine bay for visible oil leaks or residue around seals and gaskets.
2
Check the oil level using the dipstick and look for signs of contamination (e.g., burnt smell or color change).
3
Scan the vehicle's onboard diagnostics (OBD-II) for error codes related to the engine or oil pressure.
4
Examine the oil filter for proper installation and check for signs of oil leakage.
5
Inspect the exhaust for blue smoke, which indicates burning oil.
6
Perform a visual inspection of engine components such as valve cover gaskets and oil pan for cracks or wear.

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
•Oil filter wrench
•OBD-II scanner
•Drain pan

Parts Required

•New oil filter
•New engine oil (correct type and amount based on owner’s manual)
•Replacement gaskets or seals (if applicable)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the engine bay for visible oil leaks or residue around seals and gaskets.
2
Check the oil level using the dipstick and look for signs of contamination (e.g., burnt smell or color change).
3
Scan the vehicle's onboard diagnostics (OBD-II) for error codes related to the engine or oil pressure.
4
Examine the oil filter for proper installation and check for signs of oil leakage.
5
Inspect the exhaust for blue smoke, which indicates burning oil.
6
Perform a visual inspection of engine components such as valve cover gaskets and oil pan for cracks or wear.

Solution

1. Preparation

Gather tools: socket set, oil filter wrench, rags, and OBD-II scanner.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to ensure safety while working on electrical components.

2. Identify and Fix Oil Leak

Locate the Leak:
- Clean the engine area with an engine degreaser to identify the source of the leak.
Replace Seals or Gaskets:
- If a gasket (e.g., valve cover gasket) is identified as the source, remove the necessary components to access the gasket.
  - Use a socket set to remove bolts.
  - Carefully pry off the old gasket and clean the surface with a scraper.
  - Install a new gasket, ensuring proper alignment.
  - Reassemble components and tighten bolts to manufacturer specifications.

3. Change Oil and Filter (if contaminated)

Drain the Old Oil:
- Place a drain pan under the oil pan and remove the drain plug with a socket wrench.
- Allow the oil to drain completely.
Replace Oil Filter:
- Use an oil filter wrench to remove the old oil filter.
- Apply a thin layer of new oil to the rubber O-ring of the new filter and install it.
Fill with New Oil:
- Replace the drain plug and tighten it to specification.
- Using a funnel, add the correct amount and type of new oil as specified in the owner’s manual.

4. Final Checks

Start the engine and let it idle for a few minutes.
Check for leaks around the repaired areas.
Recheck oil level using the dipstick and add more oil if necessary.