why does my Volkswagen Tiguan Second Generation (2018-present) engine make a knocking sound

Volkswagen Tiguan 2nd Gen (2018-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

609 words

Problem Statement

Learn how to diagnose and fix engine knocking sound in Volkswagen Tiguan (2018-2023). Step-by-step guide with symptoms, diagnostic steps, 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 engine to cool before opening any components.

Symptoms

•Knocking or tapping noise from the engine compartment
•Loss of power during acceleration
•Engine misfires or rough idle
•Decreased fuel efficiency
•Check engine light illuminated
•Unusual vibrations felt in the cabin

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes.
2
Check the engine oil level and condition; look for signs of contamination or low oil.
3
Inspect the engine mounts for wear or damage that could transmit noise.
4
Listen for the knocking sound during different engine conditions (idle, acceleration, etc.) to determine its source.
5
Visually inspect the timing chain/belt for wear and proper tension.
6
Conduct a compression test on the engine cylinders to check for internal 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
•Socket set
•Torque wrench
•Engine oil
•Oil filter
•Compression tester
•Oil filter wrench

Parts Required

•Engine oil
•Oil filter
•Timing chain/belt (if necessary)
•Engine mounts (if necessary)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes.
2
Check the engine oil level and condition; look for signs of contamination or low oil.
3
Inspect the engine mounts for wear or damage that could transmit noise.
4
Listen for the knocking sound during different engine conditions (idle, acceleration, etc.) to determine its source.
5
Visually inspect the timing chain/belt for wear and proper tension.
6
Conduct a compression test on the engine cylinders to check for internal damage.

Solution

1. Preparation

Gather tools and materials: OBD-II scanner, socket set, torque wrench, engine oil, oil filter, compression tester.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery negative terminal to prevent electrical shorts.

2. Change Engine Oil and Filter

Drain Old Oil
- Remove the oil drain plug using a socket wrench.
- Allow the old oil to fully drain into a suitable container.
Replace Oil Filter
- Use an oil filter wrench to remove the old oil filter.
- Lubricate the rubber gasket of the new oil filter with fresh oil and install it hand-tight.
Add New Oil
- Install the drain plug back and torque it to the manufacturer’s specifications (typically around 20-25 Nm).
- Pour the recommended type and amount of engine oil into the engine (check owner’s manual for specifications).
Start Engine
- Reconnect the battery and start the engine.
- Allow it to idle for a few minutes while checking for leaks.

3. Repair or Replace Timing Chain/Belt (if necessary)

Remove Engine Covers
- Use a socket set to unbolt and remove any engine covers obstructing access to the timing components.
Inspect Timing Chain/Belt
- Check for wear, slack, or misalignment. If found defective, proceed with replacement.
Replace Timing Components
- Follow the manufacturer’s service manual for specific procedures and torque values.
- Install new timing chain/belt with proper tension and align marks as specified.

4. Inspect and Replace Engine Mounts (if necessary)

Lift Vehicle
- Safely lift the vehicle using a jack and secure it with jack stands.
Remove Old Mounts
- Unbolt the engine mounts using a socket set and lift the engine slightly to access them.
Install New Mounts
- Position new mounts and bolt them in place, ensuring they are torqued to the correct specifications.