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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, dielectric grease
• Remove the engine cover if applicable.
• Locate and remove the ignition coil and spark plug for cylinder 1:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the retaining bolt(s) using the socket set.
  3. Pull the ignition coil out gently.
  4. Use the socket set to remove the spark plug.
• Inspect the old spark plug for signs of wear and replace it with a new one.
• Apply dielectric grease to the inside of the ignition coil boot.
• Install the new spark plug and torque it to the manufacturer’s specifications (typically around 22 lb-ft).
• Reinstall the ignition coil and secure it with the retaining bolt(s). Reconnect the electrical connector.

3. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaner or replacement injector, safety glasses
• If the injector is clogged:
  1. Remove the fuel rail according to the manufacturer's procedures.
  2. Disconnect the fuel line (use a rag to catch any fuel spills).
  3. Remove the fuel injector from the rail.
• Clean the injector using an appropriate cleaning solution or replace it with a new one.
• Reinstall the injector and reassemble the fuel rail.

4. Test Compression

• Tools Required: Compression tester
• Install the compression tester in cylinder 1:
  1. Remove the spark plug from cylinder 1.
  2. Screw in the compression tester.
  3. Crank the engine to take a reading.
• Compare the reading to the manufacturer's specifications. If compression is low, further mechanical inspection may be necessary.