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

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

524 words

Problem Statement

Learn how to diagnose and fix a persistent knocking sound in your Toyota Highlander 2014-2019. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Suspension

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always use jack stands when working under a vehicle.
•Ensure the vehicle is stable and secure before starting repairs.

Symptoms

•Knocking sound when driving over bumps or uneven surfaces
•Noise increases with speed or during sharp turns
•Vibration felt through the steering wheel or floorboard
•Potential loss of handling or stability
•No check engine light illuminated

Diagnostic Steps

1
Inspect the suspension components visually for damage or wear.
2
Check for loose or damaged engine mounts.
3
Test drive the vehicle to isolate the sound’s source (front vs. rear).
4
Use a stethoscope or mechanic's listening device to pinpoint noise location.
5
Inspect the wheel bearings and CV joints for wear or damage.
6
Check and tighten all undercarriage bolts and suspension connections.

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

•Jack and jack stands
•Lug wrench
•Socket set
•Torque wrench
•Mechanic's stethoscope

Parts Required

•Suspension struts or shocks (if worn)
•Engine and transmission mounts (if damaged)
•Wheel bearings (if worn)

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Diagnostic Steps

1
Inspect the suspension components visually for damage or wear.
2
Check for loose or damaged engine mounts.
3
Test drive the vehicle to isolate the sound’s source (front vs. rear).
4
Use a stethoscope or mechanic's listening device to pinpoint noise location.
5
Inspect the wheel bearings and CV joints for wear or damage.
6
Check and tighten all undercarriage bolts and suspension connections.

Solution

1. Preparation

Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
Gather tools and safety equipment (gloves, goggles).
Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Suspension Components

Sub-steps:
1. Remove the front or rear wheel (depending on where the noise is coming from) using a lug wrench.
2. Inspect the struts, shocks, and control arms for any signs of damage or wear.
3. If any worn components are found, remove the damaged part (e.g., strut or shock) by unbolting it from the vehicle using a socket set.
4. Install new suspension parts, ensuring they are properly torqued to manufacturer specifications (refer to the repair manual for torque values).
5. Reinstall the wheel and torque the lug nuts to the specified value.

3. Check Engine and Transmission Mounts

Sub-steps:
1. Inspect the engine and transmission mounts for cracks or separation.
2. If damaged, remove the bolts securing the mounts using a socket set.
3. Replace with new mounts, ensuring they are aligned properly.
4. Re-tighten the bolts to the specified torque values.

4. Inspect Wheel Bearings and CV Joints

Sub-steps:
1. Remove the wheel and brake caliper as necessary to access the hub assembly.
2. Check the wheel bearings for play or roughness by spinning the hub.
3. If bearings are worn, replace them by removing the hub assembly and pressing out the old bearings.
4. Install new bearings, ensuring proper lubrication is applied.