why does my Toyota Highlander Third Generation (2014-2019) have a knocking sound

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

531 words

Problem Statement

Learn how to diagnose and fix knocking sounds in the Toyota Highlander Third Generation (2014-2019). Step-by-step guide with diagnostic procedures 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.

Symptoms

•Knocking or tapping noise when driving
•Noise increases with acceleration
•Possible loss of power or performance
•Engine misfire or rough idle
•Vibration felt through the steering wheel or chassis

Diagnostic Steps

1
Inspect the engine oil level and condition; low or dirty oil can cause knocking.
2
Use an OBD-II scanner to check for any stored error codes that could indicate engine problems.
3
Perform a visual inspection of the engine components, including the timing chain/belt, for any signs of wear or damage.
4
Check the exhaust system for loose components that could create knocking sounds.
5
Test drive the vehicle under different conditions to isolate the source of the noise.
6
Inspect the suspension components for wear or damage, as knocking may also originate from there.

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

•Floor jack
•Jack stands
•Wrench set
•Socket set
•OBD-II scanner
•Stethoscope

Parts Required

•Engine oil (5W-20 or as specified)
•Oil filter
•Timing belt/chain (if needed)
•Suspension components (if needed)

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Diagnostic Steps

1
Inspect the engine oil level and condition; low or dirty oil can cause knocking.
2
Use an OBD-II scanner to check for any stored error codes that could indicate engine problems.
3
Perform a visual inspection of the engine components, including the timing chain/belt, for any signs of wear or damage.
4
Check the exhaust system for loose components that could create knocking sounds.
5
Test drive the vehicle under different conditions to isolate the source of the noise.
6
Inspect the suspension components for wear or damage, as knocking may also originate from there.

Solution

1. Preparation

Tools Required: Floor jack, jack stands, wrench set, socket set, OBD-II scanner, stethoscope (for noise isolation).
Ensure the vehicle is on a flat surface and the engine is turned off.
Disconnect the battery to prevent any electrical shorts during inspection.

2. Change Engine Oil

Sub-steps:
1. Raise the vehicle using a floor jack and support it with jack stands.
2. Place an oil catch pan underneath the oil pan.
3. Remove the oil drain plug using a wrench and allow the old oil to drain completely.
4. Replace the oil filter with a new one.
5. Reinstall the drain plug and tighten to manufacturer specifications (usually around 25-30 ft-lbs).
6. Fill the engine with the appropriate grade of new oil (5W-20 or as specified in the owner’s manual).
7. Start the engine and check for leaks.

3. Inspect and Replace Timing Components

Sub-steps:
1. Remove engine covers to access the timing belt/chain.
2. Inspect the timing belt/chain for any signs of fraying or damage.
3. If damaged, replace the timing belt/chain according to the manufacturer’s guidelines.
4. Reassemble the covers after inspection/replacement.

4. Suspension Inspection and Repair

Sub-steps:
1. Inspect all suspension components (struts, shocks, control arms) for wear or damage.
2. Replace any worn or damaged parts as necessary.
3. Ensure all bolts and nuts are torqued to manufacturer specifications.