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

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector.
  • Remove the bolts securing the ignition coil.
  • Gently pull the ignition coil out of the cylinder head.
• Remove the old spark plug using a spark plug socket.
• Check the gap on the new spark plug and adjust to specifications (typically 0.028-0.032 inches).
• Install the new spark plug and torque to the manufacturer’s specification (usually around 20-25 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil is faulty:
  • Replace it with a new ignition coil compatible with Volkswagen Golf MK7.
  • Follow the same steps as above to remove and install the new coil.

4. Check and Clean or Replace Fuel Injector

• If the fuel injector is clogged:
  • Remove the fuel rail to access the injector.
  • Clean the injector using a fuel injector cleaner or replace it if necessary.
  • Reinstall the fuel rail and ensure all connections are secure.

5. Compression Test (if misfire persists)

• Reconnect the battery and perform a compression test:
  • Remove all spark plugs.
  • Insert the compression gauge into cylinder 1.
  • Crank the engine and record the compression reading.
  • Compare against manufacturer specifications (usually around 120-150 psi).
  • If low, further investigation into internal engine components may be needed.