my Volkswagen Golf has a check engine light and runs rough what does it mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool if it has been running.

2. Addressing Ignition System

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Unplug the ignition coils and remove them using a socket.
• Inspect spark plugs for wear; replace if necessary.
  • Torque new spark plugs to manufacturer specifications (typically around 15-20 ft-lbs).
• Reinstall ignition coils and ensure they are seated properly.

3. Inspecting the Air Intake System

• Tools Required: Screwdriver set, vacuum gauge
• Check the air filter and replace it if dirty.
• Inspect the intake hoses for cracks or disconnections; replace as needed.
• Ensure the Mass Air Flow (MAF) sensor is clean; use appropriate MAF cleaner if needed.

4. Checking Fuel System

• Tools Required: Fuel pressure gauge, safety goggles
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "on" position without starting the engine.
• Check the fuel pressure; it should meet manufacturer specifications (usually between 35-45 psi).
• If pressure is low, inspect the fuel pump and filter for blockages or failures.

5. Exhaust System Inspection

• Tools Required: Visual inspection tools, flashlight
• Inspect the exhaust system for visible leaks or damage.
• Pay special attention to the catalytic converter for signs of clogging or damage.
• If issues are found, replace the affected components.