my Volkswagen Golf MK7 (2015-2019) won't start and makes a clicking noise

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is in a safe and stable position, with the ignition off.
• Disconnect the battery negative terminal to prevent electrical shorts.

2. Check and Replace the Battery

• Inspect Battery: Remove the battery cover if applicable; clean any corrosion on terminals with a mixture of baking soda and water.
• Test Battery: Use the multimeter to confirm voltage; if below 12.4 volts, consider charging or replacing.
• Replace Battery: If replacement is necessary, remove the old battery by disconnecting the positive terminal first, followed by the negative terminal. Install the new battery in reverse order, ensuring terminals are tight.

3. Inspect and Replace Starter Motor (if needed)

• Remove Starter Motor: Locate the starter motor; disconnect battery negative terminal, then remove wiring harness and bolts securing the starter.
• Test Starter: Bench test the starter by applying direct voltage; if it does not engage, replace it.
• Install New Starter: Position the new starter in place, secure with bolts to the engine. Reconnect wiring harness and battery connections.

4. Reconnect and Test

• Reconnect the battery terminals (positive first, then negative).
• Start the vehicle to confirm successful repair.