why does my Toyota Highlander Third Generation (2014-2019) have excessive oil consumption

Toyota Highlander Third Generation (2014-2019)

Error Codes

4-8 hours

Time

hard

Difficulty

high

Severity

3 min read

538 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

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 opening any components.

Symptoms

•Engine oil warning light illuminated
•Unusual engine noise (ticking or knocking)
•Blue smoke from the exhaust during acceleration
•Frequent need for oil top-ups between oil changes
•Poor fuel economy
•Oil leaks or puddles under the vehicle

Diagnostic Steps

1
Check the engine oil level and condition using the dipstick.
2
Inspect for external oil leaks around gaskets, seals, and oil pan.
3
Perform a compression test to check for engine wear.
4
Conduct a leak-down test to ascertain the integrity of the piston rings and valves.
5
Scan the engine control module (ECM) for any related error codes.
6
Examine the PCV (Positive Crankcase Ventilation) valve for clogs or malfunction.

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
•Pliers
•Torque wrench
•Engine hoist

Parts Required

•New PCV valve
•Oil control rings (if replacing)
•Gasket/sealant materials

Related Faults

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Diagnostic Steps

1
Check the engine oil level and condition using the dipstick.
2
Inspect for external oil leaks around gaskets, seals, and oil pan.
3
Perform a compression test to check for engine wear.
4
Conduct a leak-down test to ascertain the integrity of the piston rings and valves.
5
Scan the engine control module (ECM) for any related error codes.
6
Examine the PCV (Positive Crankcase Ventilation) valve for clogs or malfunction.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Allow the engine to cool down for safety.

2. Check and Replace PCV Valve

Tools Required: Pliers, socket set.
Sub-steps:
1. Locate the PCV valve, usually found on the valve cover.
2. Disconnect the hose attached to the PCV valve using pliers.
3. Remove the old PCV valve by twisting and pulling it out.
4. Install the new PCV valve by pushing it into place.
5. Reattach the hose securely.

3. Inspect and Replace Oil Control Rings (if necessary)

Tools Required: Socket set, torque wrench, engine hoist (if removing the engine).
Sub-steps:
1. Remove the engine from the vehicle (if applicable).
2. Remove the oil pan and inspect the oil control rings.
3. Replace the oil control rings if they are worn or damaged.
4. Reassemble the engine and reinstall it into the vehicle.
5. Refill the engine with the appropriate oil type.

4. Address External Leaks

Tools Required: Socket set, gasket scraper, RTV silicone sealant.
Sub-steps:
1. Identify the source of any oil leaks (gaskets or seals).
2. Remove the affected components to access the gaskets.
3. Clean the surface with a gasket scraper to ensure a proper seal.
4. Apply RTV silicone sealant and reassemble the components.
5. Tighten bolts to the manufacturer's specified torque values.