my Skoda Octavia NFL (2020-Present) engine makes a knocking noise what could it be

Solution

1. Preparation

• Tools Required: OBD-II scanner, mechanic's stethoscope, compression tester, socket set, torque wrench.
• Safety Warnings: Disconnect the battery before working on electrical components; allow the engine to cool before inspection.

2. Change Engine Oil and Filter

• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Remove the oil drain plug and allow old oil to completely drain into a pan.
  3. Replace the oil filter using an oil filter wrench.
  4. Reinstall the oil drain plug and tighten to the manufacturer's torque specifications.
  5. Refill the engine with new engine oil as per the manufacturer's specification (check owner's manual for oil type and capacity).

3. Inspect and Replace Worn Components

• Sub-steps:
  1. Identify the source of the knocking noise using the mechanic's stethoscope.
  2. If the noise is due to worn engine mounts, remove the damaged mounts using a socket set and replace with new ones.
  3. If the issue is related to timing components (timing belt/chain), remove the necessary covers to access and inspect them for wear.
  4. Replace any worn belts, chains, or tensioners with new parts as needed.

4. Perform a Valve Adjustment (if applicable)

• Sub-steps:
  1. Remove the valve cover to access the valve train.
  2. Use a feeler gauge to check the valve clearances as specified in the service manual.
  3. Adjust the valves if necessary by loosening the lock nut and turning the adjuster screw to achieve the correct clearance.
  4. Reinstall the valve cover with a new gasket to prevent leaks.