how to fix the oil consumption issue in my Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

647 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 in 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 the battery before working on electrical systems.
•Allow the engine to cool before opening the oil drain plug and working on the engine.

Symptoms

•Check engine light illuminated
•Increased frequency of oil top-ups
•Blue smoke from the exhaust
•Engine knocking or ticking noise
•Poor fuel economy
•Oil spots or leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for related engine issues.
2
Inspect the oil dipstick and perform an oil level check to determine the extent of oil consumption.
3
Conduct a visual inspection of the engine for oil leaks, particularly around gaskets and seals.
4
Perform a compression test on the cylinders to assess engine health.
5
Inspect the PCV (Positive Crankcase Ventilation) valve for functionality and blockages.
6
Check the condition of the oil filter and ensure it is not clogged or damaged.

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
•Torque wrench
•Oil filter wrench
•Pliers
•Gasket scraper
•Oil catch pan

Parts Required

•PCV valve
•Gaskets (valve cover, oil pan, etc.)
•Engine oil
•Oil filter

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for related engine issues.
2
Inspect the oil dipstick and perform an oil level check to determine the extent of oil consumption.
3
Conduct a visual inspection of the engine for oil leaks, particularly around gaskets and seals.
4
Perform a compression test on the cylinders to assess engine health.
5
Inspect the PCV (Positive Crankcase Ventilation) valve for functionality and blockages.
6
Check the condition of the oil filter and ensure it is not clogged or damaged.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to eliminate any electrical hazards.

2. Replace PCV Valve

Tools Required: Socket set, pliers, replacement PCV valve
Remove the engine cover (if applicable) to access the PCV valve.
Disconnect the hose connected to the PCV valve using pliers.
Unscrew the old PCV valve from its housing and replace it with a new one.
Reconnect the hose securely to the new PCV valve.
Reinstall the engine cover.

3. Inspect and Replace Gaskets

Tools Required: Socket set, torque wrench, gasket scraper, new gaskets
Identify and locate the gaskets that may be contributing to oil leaks (valve cover gasket, oil pan gasket).
Remove the necessary components to access the gaskets (e.g., intake manifold if required).
Carefully scrape off the old gasket material from the surfaces.
Install new gaskets, ensuring proper alignment and sealing.
Reassemble all removed components, following torque specifications for bolts.

4. Engine Oil Change

Tools Required: Oil filter wrench, oil catch pan, socket set, new oil and oil filter
Place an oil catch pan beneath the oil pan.
Remove the oil drain plug and allow the old oil to drain completely.
Replace the oil drain plug and tighten to specification.
Remove the old oil filter using an oil filter wrench.
Install the new oil filter, ensuring a proper seal.
Fill the engine with new oil, checking the owner’s manual for the correct type and amount.