how to fix P0301 misfire code on Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector for cylinder 1.
  3. Unbolt the ignition coil and carefully remove it.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear, carbon buildup, or damage.
  6. If necessary, replace with a new spark plug that meets OEM specifications (typically NGK or Bosch).
  7. Torque the spark plug to manufacturer specifications (approximately 22 lb-ft).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, inspect the ignition coil for cracks or corrosion.
  2. If defective, replace the ignition coil with a new one that matches OEM specifications.
  3. Reinstall the ignition coil and reconnect the electrical connector securely.

4. Inspect Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Remove the fuel rail if necessary to access the injector.
  3. Inspect the injector for blockages or leaks.
  4. If the injector is faulty, replace it with a new component.
  5. Reinstall the fuel rail and reconnect all electrical connectors.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Inspect all vacuum lines connected to the intake manifold.
  2. Replace any cracked or disconnected vacuum hoses.
  3. Use a smoke machine or carburetor cleaner to check for leaks around the intake manifold.