how to fix P0301 misfire code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before working on it.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
  3. Use a spark plug socket to remove the old spark plug.
  4. Inspect the new spark plug gap and adjust to manufacturer specifications.
  5. Install the new spark plug and torque to the recommended specification (typically around 22 lb-ft).
  6. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Using a multimeter, test the ignition coil for primary and secondary resistance.
  2. If the coil is faulty, remove it and replace it with a new one.
  3. Reconnect the ignition coil and ensure all connections are secure.

4. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the reading with manufacturer specifications. If low, investigate further for possible valve or piston issues.

5. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector.
  2. Remove the fuel rail to access the injector.
  3. Inspect the injector for clogs and clean it using a fuel injector cleaner if necessary.
  4. Reinstall the injector and fuel rail, ensuring proper sealing.