why is my Volkswagen Golf Eighth Generation (2020-present) check engine light flashing

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery to prevent electrical shorts.

2. Address Ignition System Issues

• Sub-steps:
  • Remove the engine cover if necessary.
  • Disconnect the ignition coil connectors.
  • Remove the ignition coils using a socket set.
  • Inspect each spark plug for wear or damage; replace if necessary.
  • Reinstall the ignition coils, ensuring they are seated properly.
  • Reconnect the ignition coil connectors.

3. Repair Fuel System

• Sub-steps:
  • Locate the fuel rail and connect a fuel pressure gauge.
  • Start the engine and monitor fuel pressure; it should meet manufacturer specifications (consult service manual).
  • If pressure is low, inspect the fuel filter and pump for blockages or failures.
  • Replace the fuel filter if clogged and consider replacing the fuel pump if it fails the pressure test.

4. Resolve Vacuum Leaks

• Sub-steps:
  • Inspect vacuum hoses for cracks or disconnections.
  • Use a smoke machine or propane to test for leaks.
  • Replace any damaged hoses or clamps.

5. Check Exhaust System

• Sub-steps:
  • Visually inspect the exhaust system for dents or rust that could indicate a blockage.
  • Use a pressure gauge to test the back pressure in the exhaust; it should be within the manufacturer’s specifications.
  • Replace the catalytic converter if it is found to be clogged.