why is my Toyota Highlander Fourth Generation (2020-present) making a knocking noise from the engine

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

2 min read

315 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix engine knocking noise in Toyota Highlander (2020-present). 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 negative battery terminal to prevent electrical shocks

Symptoms

•Knocking or tapping noise coming from the engine
•Loss of engine power or performance
•Check engine light illuminated on the dashboard
•Rough engine idle or misfiring
•Increased engine temperature or overheating

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes
2
Inspect the engine oil level and condition to ensure it is at the correct level and not contaminated
3
Check for loose or damaged engine components such as the valve cover, heat shields, or exhaust components
4
Listen for the noise while using a mechanic's stethoscope to pinpoint the source of the knocking sound
5
Perform a compression test on the engine cylinders to check for internal damage
6
Inspect the timing chain/belt for proper tension and wear

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
•Socket set
•Drain pan
•Oil filter wrench
•Mechanic's stethoscope

Parts Required

•Oil Filter
•Battery
•Gasket

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes
2
Inspect the engine oil level and condition to ensure it is at the correct level and not contaminated
3
Check for loose or damaged engine components such as the valve cover, heat shields, or exhaust components
4
Listen for the noise while using a mechanic's stethoscope to pinpoint the source of the knocking sound
5
Perform a compression test on the engine cylinders to check for internal damage
6
Inspect the timing chain/belt for proper tension and wear

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shocks.

2. Drain Engine Oil

Sub-steps:
1. Place a drain pan under the oil pan.
2. Remove the oil drain plug using a socket wrench.
3. Allow old oil to fully drain into the pan.
Tools Required: Socket set, drain pan.

3. Inspect and Replace Engine Oil Filter

Sub-steps:
1. Locate the oil filter and remove it using an oil filter wrench.
2. Apply a thin layer of new oil on the rubber gasket of the new oil filter.
3. Install the new oil filter and tighten it to the manufacturer's specifications.
Tools Required: Oil filter wrench, socket set.

4. Refill Engine Oil

Sub-steps:
1. Replace the drain plug and tighten it to the specified torque (usually around 25-30