my Volkswagen Golf Eighth Generation (2020-present) has a check engine light and no power

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool before beginning repairs.

2. Addressing Error Codes

• Use the OBD-II scanner to retrieve error codes.
• Research the codes to determine the specific issue (e.g., P0300 for misfire, P0420 for catalytic converter efficiency).
• Clear the codes after addressing the issue to reset the check engine light.

3. Inspect and Clean Components

• Throttle Body Cleaning:

  • Remove the air intake duct connected to the throttle body.
  • Use throttle body cleaner and a soft cloth to clean the throttle body.
  • Reinstall the air intake duct securely.

• Fuel System Inspection:

  • Check the fuel pressure using a fuel pressure gauge.
  • If pressure is low, replace the fuel filter and/or fuel pump as necessary.
  • Inspect fuel lines for any leaks or damage.

4. Repairing Vacuum Leaks

• Inspect and replace any cracked or damaged vacuum hoses.
• Ensure all connections to the intake manifold are secure and leak-free.

5. Battery and Alternator Check

• Test the battery with a multimeter to ensure it is providing adequate voltage (12.6V or higher).
• Check the alternator output while the engine is running (should be between 13.7V to 14.7V).
• Replace the battery or alternator if they are not functioning correctly.