why does my Toyota Highlander Third Generation (2014-2019) consume so much oil

Toyota Highlander Third Generation (2014-2019)

Error Codes

3-5 hours

Time

hard

Difficulty

high

Severity

3 min read

570 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

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before draining oil or working on components.

Symptoms

•Check engine light illuminated
•Engine oil low warning on the dashboard
•Blue smoke from the exhaust during acceleration
•Frequent need to add oil between changes
•Unusual engine noises, such as knocking or ticking
•Decreased fuel efficiency

Diagnostic Steps

1
Inspect the oil level and condition using the dipstick.
2
Check for oil leaks around the engine and under the vehicle.
3
Scan the vehicle's computer for any diagnostic trouble codes (DTCs) using an OBD-II scanner.
4
Perform a compression test on the engine cylinders to check for wear or damage.
5
Inspect the PCV (Positive Crankcase Ventilation) system for blockages or malfunctions.
6
Examine the condition of spark plugs for signs of oil fouling.

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 catch pan
•Compression tester

Parts Required

•Engine oil (as per specifications)
•Oil filter
•Valve cover gasket (if necessary)
•PCV valve (if necessary)

Related Faults

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Diagnostic Steps

1
Inspect the oil level and condition using the dipstick.
2
Check for oil leaks around the engine and under the vehicle.
3
Scan the vehicle's computer for any diagnostic trouble codes (DTCs) using an OBD-II scanner.
4
Perform a compression test on the engine cylinders to check for wear or damage.
5
Inspect the PCV (Positive Crankcase Ventilation) system for blockages or malfunctions.
6
Examine the condition of spark plugs for signs of oil fouling.

Solution

1. Preparation

Gather tools and materials: OBD-II scanner, socket set, oil catch pan, new oil and filter, torque wrench, and compression tester.
Ensure the vehicle is parked on a level surface and the engine is cool.

2. Address Oil Leaks

Sub-step 1: Clean the engine and surrounding area with degreaser to identify leaks.
Sub-step 2: Inspect oil pan, valve cover gaskets, and seals for leaks.
Sub-step 3: Replace any damaged gaskets or seals with new parts.

3. Replace Oil and Filter

Sub-step 1: Remove the oil drain plug using a socket wrench and drain the old oil into an oil catch pan.
Sub-step 2: Replace the oil filter with a new one, ensuring the rubber O-ring is lubricated with new oil before installation.
Sub-step 3: Reinstall the oil drain plug and torque it to manufacturer specifications (typically around 30 lb-ft).
Sub-step 4: Add the appropriate type and amount of new oil as specified in the owner's manual.

4. Inspect and Repair PCV System

Sub-step 1: Locate the PCV valve and inspect it for clogs or damage.
Sub-step 2: Clean or replace the PCV valve as necessary.
Sub-step 3: Ensure all hoses connected to the PCV system are free from cracks or blockages.

5. Perform Compression Test

Sub-step 1: Remove spark plugs and insert compression tester into each cylinder.
Sub-step 2: Crank the engine and record the compression readings.
Sub-step 3: Compare readings against manufacturer specifications; replace piston rings or valves if readings are low.