my Volkswagen Golf has a check engine light and it’s running rough what's wrong

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Address Fault Codes

• Sub-step 1: Use the OBD-II scanner to retrieve and document any fault codes.
• Sub-step 2: Research the fault codes to determine the specific components that may require inspection or replacement.

3. Replace Faulty Components

• Sub-step 1: If spark plugs are found to be worn:
  • Remove the ignition coils using a socket set.
  • Unscrew and replace the spark plugs with new ones, ensuring they are torqued to the manufacturer's specifications (usually around 15-20 lb-ft).
• Sub-step 2: If fuel delivery issues are detected:
  • Locate the fuel filter and replace it according to the service manual.
  • Recheck fuel pressure after replacement to ensure it meets specifications.

4. Inspect and Repair Vacuum Leaks

• Sub-step 1: Visually inspect all vacuum lines for cracks or disconnections.
• Sub-step 2: Replace any damaged lines and ensure all connections are secure.

5. Reassemble and Test

• Reconnect all components removed during the repair.
• Reconnect the battery and clear any fault codes using the OBD-II scanner.