how to fix oil consumption issues on my Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Error Codes

4-8 hours

Time

hard

Difficulty

high

Severity

3 min read

527 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 excessive oil consumption issues in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostics, and solutions.

Affected Component

Engine

Estimated Time

4-8 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before beginning any work.

Symptoms

•Engine oil warning light illuminated on the dashboard
•Noticeable decrease in engine oil level between oil changes
•Blue smoke from the exhaust during acceleration
•Rough engine idle
•Increased engine noise or knocking sounds

Diagnostic Steps

1
Check engine oil level using the dipstick to confirm low oil levels.
2
Inspect for external oil leaks around the oil pan, valve covers, and gaskets.
3
Conduct a compression test on all cylinders to determine if there are any internal leaks.
4
Perform a visual inspection of the PCV (Positive Crankcase Ventilation) system for blockages or failures.
5
Use an OBD-II scanner to check for any engine codes that may indicate related issues.
6
Examine the condition of the spark plugs for oil fouling which can indicate oil entering the combustion chamber.

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
•Compression tester
•Socket set
•Torque wrench
•Screwdrivers
•Oil filter wrench

Parts Required

•New PCV valve
•Piston rings (if necessary)
•Valve seals (if necessary)
•Gaskets (if necessary)

Related Faults

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Diagnostic Steps

1
Check engine oil level using the dipstick to confirm low oil levels.
2
Inspect for external oil leaks around the oil pan, valve covers, and gaskets.
3
Conduct a compression test on all cylinders to determine if there are any internal leaks.
4
Perform a visual inspection of the PCV (Positive Crankcase Ventilation) system for blockages or failures.
5
Use an OBD-II scanner to check for any engine codes that may indicate related issues.
6
Examine the condition of the spark plugs for oil fouling which can indicate oil entering the combustion chamber.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace PCV Valve

Locate the PCV valve on the engine.
Remove the PCV valve by twisting and pulling it out of the grommet.
Inspect the valve for clogs or signs of wear.
Replace with a new PCV valve if necessary.
Reinstall the valve securely into the grommet.

3. Address Internal Oil Consumption

If the compression test indicates low compression, consider:
- Replacing piston rings:
  1. Remove the engine from the vehicle.
  2. Disassemble the engine to access the pistons.
  3. Replace old piston rings with new ones.
  4. Reassemble the engine ensuring all torque specifications are followed.
- Replacing valve seals:
  1. Remove the valve cover.
  2. Replace old valve seals with new ones.
  3. Reassemble the valve cover with new gaskets.

4. Check for Oil Leaks

Inspect and replace any worn gaskets or seals found during the visual inspection.
Tighten any loose bolts or connections that may contribute to leaks.