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

591 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, diagnostic steps, and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems
•Allow the engine to cool before opening the oil drain plug or working in the engine bay

Symptoms

•Burning oil odor in the cabin
•Oil spots on the ground where the vehicle is parked
•Engine oil level dropping without visible leaks
•Smoke coming from the engine bay
•Check engine light illuminated
•Engine running rough or misfiring

Diagnostic Steps

1
Inspect for oil leaks around the engine block, oil pan, and gaskets
2
Check oil level using the dipstick to determine if it is low
3
Use an OBD-II scanner to check for any stored error codes related to engine performance
4
Inspect gaskets, seals, and hoses for signs of wear or damage
5
Look for signs of oil burning in the exhaust system
6
Check for any signs of burnt oil residue around the engine bay

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
•Oil catch pan
•Oil filter wrench
•Multimeter

Parts Required

•Valve cover gasket
•Oil pan gasket
•Oil filter
•Engine oil

Related Faults

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Diagnostic Steps

1
Inspect for oil leaks around the engine block, oil pan, and gaskets
2
Check oil level using the dipstick to determine if it is low
3
Use an OBD-II scanner to check for any stored error codes related to engine performance
4
Inspect gaskets, seals, and hoses for signs of wear or damage
5
Look for signs of oil burning in the exhaust system
6
Check for any signs of burnt oil residue around the engine bay

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to prevent any electrical issues while working on the vehicle.

2. Identify and Repair Leaks

Tools Required: Socket set, oil catch pan, rags.
Sub-steps:
- Clean the engine area with a degreaser to remove old oil residues.
- Use the visual inspection results to pinpoint the leak source.
- Replace any damaged gaskets or seals (e.g., valve cover gasket, oil pan gasket) by removing the affected components as needed.
- Torque new gaskets to specifications (consult repair manual for specific torque values).

3. Replace Oil

Tools Required: Oil filter wrench, funnel, socket set, oil catch pan.
Sub-steps:
- Drain the old oil into an oil catch pan by removing the oil drain plug.
- Replace the oil filter using an oil filter wrench.
- Reinstall the drain plug and refill the engine with the correct type and amount of oil (consult owner's manual for specifications).

4. Test for Smoke

Tools Required: None.
Sub-steps:
- Start the engine and allow it to idle.
- Observe for any smoke or continued burning oil smell.
- Let the engine run for a few minutes and watch for signs of leaks or smoke.