why is my Volkswagen Golf MK7 (2015-2019) check engine light flashing?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool before starting work.
• Disconnect the battery to avoid electrical issues.

2. Inspect Ignition System

• Tools Required: Socket set, torque wrench.
• Remove the engine cover to access ignition coils.
• Sub-steps:
  • Unplug the electrical connectors from the ignition coils.
  • Remove the ignition coils using a socket set.
  • Inspect the coils for cracks or damage; replace if necessary.
  • Check the spark plugs for wear; replace if they show signs of excessive wear or fouling.
  • Reinstall the ignition coils and cover, ensuring proper torque specifications.

3. Check Fuel System

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition on (do not start the engine) to check fuel pressure.
  • Compare the reading to manufacturer specifications; replace the fuel pump if pressure is low.
  • Inspect fuel injectors for clogs; clean or replace if necessary.

4. Inspect Intake and Vacuum System

• Tools Required: Vacuum gauge.
• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Use a vacuum gauge to check for leaks in the intake manifold.
  • Replace any damaged hoses and recheck the system.

5. Final Assembly and Testing

• Reconnect the battery.
• Clear error codes using the OBD-II scanner.
• Start the engine and monitor for the check engine light and any abnormal symptoms.