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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1:
  • Unscrew the bolts securing the coil.
  • Gently pull the coil out of the spark plug well.
• Remove the old spark plug:
  • Use a spark plug socket to unscrew and remove the spark plug from the cylinder head.
• Install the new spark plug:
  • Apply anti-seize lubricant to the threads of the new spark plug.
  • Hand-tighten the spark plug and then torque to the manufacturer's specification (typically around 15-20 lb-ft).

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the faulty ignition coil:
  • Disconnect the electrical connector.
  • Unscrew the mounting bolts and remove the coil.
• Install the new ignition coil:
  • Position the new coil in place and secure it with the mounting bolts.
  • Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or appropriate cleaning solvent.
• Remove the fuel injector for cylinder 1:
  • Disconnect the fuel line and electrical connector.
  • Unscrew the retaining clips and remove the injector.
• Clean the injector using a cleaning kit or solvent.
• Reinstall the cleaned or new fuel injector, ensuring all connections are secure.

5. Perform Compression Test (if necessary)

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole and crank the engine.
• Record the compression reading and compare it to specifications (typically between 150-200 psi).
• If compression is low, further investigation of the engine internals may be required.