how to fix my Volkswagen Golf MK7 (2015-2019) that won't start and just clicks

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, screwdriver set, wire brush.
• Ensure the vehicle is in a safe, well-ventilated area, and the parking brake is engaged.
• Disconnect the negative battery terminal to prevent accidental short circuits.

2. Battery Inspection and Replacement

1. Inspect Battery Condition
   • Check for physical damage or swelling.
   • Clean corrosion from battery terminals using a wire brush.
2. Test Battery Voltage
   • Reconnect the battery and measure the voltage; if below 12.4 volts, consider charging or replacing the battery.
3. Replace Battery (if necessary)
   • Remove the battery hold-down clamp using a socket set.
   • Disconnect the positive terminal first, followed by the negative terminal.
   • Install the new battery by connecting the positive terminal first, then the negative terminal.
   • Secure the battery with the hold-down clamp.

3. Starter Motor Inspection

1. Locate and Remove Starter Motor
   • Remove any components obstructing access to the starter motor (e.g., air intake ducts).
   • Disconnect the wiring harness from the starter motor.
   • Remove the starter motor bolts using a socket set and carefully extract the starter.
2. Test Starter Motor
   • Bench-test the starter motor with a fully charged battery to ensure it operates correctly.
3. Replace Starter Motor (if necessary)
   • If the starter fails the bench test, install a new starter motor by reversing the removal steps, ensuring all connections are secure.

4. Final Checks

1. Reconnect Battery and Test
   • Reconnect the negative battery terminal.
   • Attempt to start the engine to verify proper operation.