my Volkswagen Golf MK7 (2015-2019) has a strange noise during cold starts, what should I do?

Solution

1. Preparation

• Tools Required: OBD-II scanner, mechanic's stethoscope, socket set, torque wrench, screwdriver.
• Ensure the vehicle is parked on a level surface.
• Disconnect the negative battery cable to prevent electrical issues.

2. Replace Engine Oil and Filter

• Sub-steps:
  1. Place an oil drain pan underneath the oil pan.
  2. Remove the oil drain plug using a socket wrench and allow old oil to drain completely.
  3. Replace the oil filter using an oil filter wrench; lubricate the rubber O-ring on the new filter with fresh oil before installation.
  4. Reinstall the drain plug and torque it to the manufacturer’s specifications (typically around 25-30 Nm).
  5. Fill the engine with the recommended oil type (5W-30 or as specified in the owner’s manual) using a funnel.

3. Inspect and Replace Timing Belt/Chain (if necessary)

• Sub-steps:
  1. Remove any engine covers that obstruct access to the timing belt/chain.
  2. Align the timing marks on the crankshaft and camshaft.
  3. Remove the timing belt/chain tensioner and the belt/chain itself.
  4. Replace with a new timing belt/chain, ensuring proper tension and alignment.
  5. Reassemble all components and covers, torquing to specifications.

4. Reconnect Battery and Test

• Reconnect the negative battery cable.
• Start the engine and listen for any remaining noises.