why is my Toyota Highlander Third Generation (2014-2019) making a knocking noise

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

547 words

Problem Statement

Learn how to diagnose and fix knocking noise in 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

•Ensure the vehicle is on a flat surface
•Engage the parking brake
•Wear safety glasses
•Disconnect the battery before working on electrical systems
•Allow the engine to cool before opening the hood or working on any components

Symptoms

•Knocking sound when accelerating or decelerating
•Noise present during idling
•Increased vibration felt in the cabin
•Unusual noises when turning or going over bumps
•Check engine light illuminated

Diagnostic Steps

1
Inspect under the hood: Check for any loose components, damaged belts, or signs of fluid leaks.
2
Scan for error codes: Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may indicate engine issues.
3
Check the engine oil level: Ensure the engine oil is at the correct level and inspect for any signs of contamination or metal shavings.
4
Examine the suspension components: Inspect the struts, shock absorbers, and control arms for wear or damage.
5
Listen for noise: Use a mechanic's stethoscope to pinpoint the source of the noise (engine, transmission, or suspension).
6
Inspect the drivetrain: Check CV joints, axles, and differential for play or damage.

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

Parts Required

•Engine oil and oil filter
•Suspension components (struts, control arms, bushings) if damaged
•CV joints/axles if worn or damaged

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Diagnostic Steps

1
Inspect under the hood: Check for any loose components, damaged belts, or signs of fluid leaks.
2
Scan for error codes: Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may indicate engine issues.
3
Check the engine oil level: Ensure the engine oil is at the correct level and inspect for any signs of contamination or metal shavings.
4
Examine the suspension components: Inspect the struts, shock absorbers, and control arms for wear or damage.
5
Listen for noise: Use a mechanic's stethoscope to pinpoint the source of the noise (engine, transmission, or suspension).
6
Inspect the drivetrain: Check CV joints, axles, and differential for play or damage.

Solution

1. Preparation

Tools Required: OBD-II scanner, mechanic's stethoscope, socket set, jack and jack stands, torque wrench.
Safety Warnings: Ensure the vehicle is on a flat surface, engage the parking brake, and wear safety glasses.

2. Engine Inspection and Oil Change (if needed)

Step 1: Check engine oil: Remove the dipstick, wipe it clean, reinsert, and check the oil level. If low, top up with the manufacturer-recommended oil.
Step 2: Change oil and filter: If the oil appears contaminated, drain the oil, replace the oil filter, and refill with new oil of the correct type and viscosity.

3. Suspension Component Replacement (if applicable)

Step 1: Lift the vehicle: Use a jack to lift the Highlander and secure it with jack stands.
Step 2: Inspect and replace components: Check struts, control arms, and bushings for wear. Remove any damaged components using a socket set and replace them with new parts. Torque to manufacturer specifications.

4. Drivetrain Repair (if applicable)

Step 1: Inspect CV joints and axles: Remove the wheel and brake assembly to access the axles.
Step 2: Replace damaged axles: If CV joints show signs of wear or damage, remove them and replace with new units. Follow torque specifications when reinstalling.