why does my Volkswagen Tiguan First Generation (2007-2018) make a loud noise when starting

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, mechanic's stethoscope.
• Ensure the vehicle is parked on a flat surface and the ignition is off.

2. Battery and Connections

• Sub-steps:
  1. Disconnect the negative battery cable to ensure safety.
  2. Clean battery terminals using a wire brush and baking soda solution to remove corrosion.
  3. Reconnect the battery and check if the noise persists upon starting.

3. Starter Motor Replacement

• Sub-steps:
  1. Disconnect the negative battery cable.
  2. Remove any components obstructing access to the starter motor, such as the air intake duct.
  3. Unbolt the starter motor from its mounting using a socket set.
  4. Disconnect the electrical connectors from the starter motor.
  5. Install the new starter motor by reversing the removal steps, ensuring all connections are secure.
  6. Torque the starter motor bolts to the manufacturer's specifications (usually around 15-20 Nm).
  7. Reconnect the negative battery cable.

4. Ignition System Check

• Sub-steps:
  1. Remove spark plugs using a socket set.
  2. Inspect spark plugs for wear or damage; replace if necessary.
  3. Test ignition coils with a multimeter to ensure they are within specifications.
  4. Reinstall spark plugs and ignition components.