my Toyota Highlander makes a knocking sound when accelerating, what should I check?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

504 words

Problem Statement

Learn how to diagnose and fix knocking sound during acceleration in Toyota Highlander. 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 performing any electrical work.
•Allow the engine to cool completely before starting the inspection or repair.

Symptoms

•Knocking sound during acceleration
•Possible vibration felt in the vehicle
•Reduced engine performance or responsiveness
•Check engine light may be illuminated
•Unusual smells (e.g., burning oil or fuel)

Diagnostic Steps

1
Inspect the engine oil level and condition; look for metal shavings or contaminants.
2
Check for any diagnostic trouble codes (DTC) using an OBD-II scanner.
3
Visually inspect the exhaust system for loose or damaged components.
4
Examine the engine mounts for wear or damage.
5
Test drive the vehicle to replicate the knocking sound and determine its origin.
6
Inspect the suspension components for wear, such as struts, shocks, or bushings.

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
•OBD-II scanner
•Socket set
•Wrench set
•Torque wrench
•Safety goggles

Parts Required

•Engine oil
•Oil filter
•Engine mounts (if damaged)
•Suspension components (if worn)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the engine oil level and condition; look for metal shavings or contaminants.
2
Check for any diagnostic trouble codes (DTC) using an OBD-II scanner.
3
Visually inspect the exhaust system for loose or damaged components.
4
Examine the engine mounts for wear or damage.
5
Test drive the vehicle to replicate the knocking sound and determine its origin.
6
Inspect the suspension components for wear, such as struts, shocks, or bushings.

Solution

1. Preparation

Tools Required: Jack and jack stands, OBD-II scanner, socket set, wrench set, torque wrench, and safety goggles.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to prevent electrical shorts during inspection.

2. Engine Oil Inspection

Remove the oil dipstick and check oil level; add oil if low.
If oil is dirty or has metallic particles, perform an oil change.
- Sub-steps:
  1. Drain the old oil by removing the oil pan bolt.
  2. Replace the oil filter with a new one.
  3. Refill with the recommended oil type and capacity (refer to the owner’s manual).

3. Exhaust System Inspection

Inspect the exhaust system visually for loose brackets or damaged pipes.
- Sub-steps:
  1. Start from the exhaust manifold and work towards the tailpipe.
  2. Tighten any loose bolts or replace damaged components.

4. Engine Mount Inspection

Check the engine mounts for cracks or separation.
- Sub-steps:
  1. With the vehicle securely lifted, inspect all mounts visually.
  2. Replace any damaged mounts using appropriate tools and torque specifications.

5. Suspension Component Inspection

Examine all suspension components for wear and damage.
- Sub-steps:
  1. Check the struts and shocks for leaks or physical damage.
  2. Replace worn components using proper torque values for bolts.