Why is my 2020 Toyota Highlander’s engine making a ticking noise?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

682 words

Problem Statement

Learn how to diagnose and repair the ticking noise from the engine of your 2020 Toyota Highlander with our step-by-step guide.

Affected Component

engine

Estimated Time

2-4 hours

Symptoms

•A noticeable ticking noise coming from the engine compartment, particularly during idle or acceleration.
•Noise may vary with engine speed.
•Potential loss of power or rough idling may accompany the ticking noise.

Diagnostic Steps

1
Check the engine oil level using the dipstick.
2
Look for any visible oil leaks around the engine.
3
Inspect the exhaust system for any signs of damage or leaks.
4
Use a mechanic's stethoscope or a long screwdriver to localize the source of the ticking noise.
5
Remove the oil dipstick and check the oil's color and consistency.
6
With the engine running, remove the oil filler cap and listen for changes in the ticking sound.
7
Use a smoke test or a soapy water spray on the exhaust connections to check for leaks.

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

•Mechanic's stethoscope or long screwdriver
•Oil dipstick
•Socket set and wrenches
•Torque wrench
•Engine oil
•Oil filter wrench
•Torque specifications chart
•Safety glasses and gloves

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Diagnostic Steps

1
Check the engine oil level using the dipstick.
2
Look for any visible oil leaks around the engine.
3
Inspect the exhaust system for any signs of damage or leaks.
4
Use a mechanic's stethoscope or a long screwdriver to localize the source of the ticking noise.
5
Remove the oil dipstick and check the oil's color and consistency.
6
With the engine running, remove the oil filler cap and listen for changes in the ticking sound.
7
Use a smoke test or a soapy water spray on the exhaust connections to check for leaks.

Solution

Problem: Ticking Noise from the Engine of a 2020 Toyota Highlander

Possible Causes:

Low Oil Level or Oil Quality: Insufficient or degraded oil may not provide adequate lubrication to engine components.
Lifter Problems: Hydraulic lifters may be failing or malfunctioning, leading to improper valve operation and noise.
Exhaust Leak: A leak in the exhaust manifold or gasket can produce a ticking sound similar to that of a mechanical issue.
Valvetrain Issues: Problems with the timing chain/belt or other valvetrain components can cause ticking.
Fuel Injector Noise: The sound may be from the fuel injectors, which can create a ticking noise during operation.

Tools Required:

Mechanic's stethoscope or long screwdriver
Oil dipstick
Socket set and wrenches
Torque wrench
Engine oil (if replacement is needed)
Oil filter wrench (if oil change is needed)
Torque specifications chart (for reassembly)
Safety glasses and gloves

Repair Instructions:

Step 1: Check Oil Level and Quality

Ensure the vehicle is on a level surface.
Pull out the dipstick, wipe it clean, reinsert, and remove it again to check the level.
If low, add the recommended oil (SAE 0W-20 for Highlander) until it reaches the correct level. If oil quality is poor, proceed to an oil change.

Step 2: Change Engine Oil and Filter

Warm up the engine slightly for easier oil drainage, then turn it off.
Place a drain pan under the oil pan and remove the drain plug using the appropriate socket.
Allow the oil to fully drain.
Remove the old oil filter using an oil filter wrench.
Install a new oil filter, lubricate the rubber gasket with new oil, and tighten it by hand.
Reinstall the drain plug with a torque wrench to the manufacturer's specification.
Fill the engine with new oil, start the engine, and check for leaks.

Step 3: Inspect and Adjust Valvetrain Components

If the ticking persists, remove the valve cover by loosening the bolts in a criss-cross pattern.
Inspect the hydraulic lifters for wear or damage. Replace if necessary.
Check the timing chain/belt for wear or misalignment, adjusting or replacing as needed.

Step 4: Examine the Exhaust System

If no issues are found in the valvetrain, inspect the exhaust manifold and gaskets closely.
Use the smoke test or soapy water spray to identify any leaks.
Replace gaskets or tighten connections as necessary.

Conclusion:

After completing these steps, start the engine and listen for the ticking noise. If the problem persists, further diagnostics may be required, potentially involving a more in-depth inspection by a qualified technician or dealership. Always refer to the vehicle's service manual for specific torque specifications and repair procedures.