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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate the spark plug for cylinder 1 (refer to the owner's manual for its position).
  3. Using a spark plug socket, carefully remove the spark plug.
  4. Inspect the old spark plug for signs of wear. If worn, replace with a new spark plug of the specified type (e.g., NGK, OEM part).
  5. Torque the new spark plug to the manufacturer's specifications (usually around 25 Nm).
  6. Reconnect the ignition coil to the new spark plug.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Remove the ignition coil for cylinder 1 by unfastening any retaining bolts or clips.
  2. Inspect the ignition coil for signs of damage or wear.
  3. If defective, replace it with a new ignition coil (ensure compatibility with the MK7.5).
  4. Reinstall the ignition coil and secure it properly.

4. Check and Clean Fuel Injector

• Sub-steps:
  1. Remove the fuel injector connector for cylinder 1.
  2. Use a fuel injector cleaning kit to clean the injector or replace it if clogged.
  3. Reconnect the injector and ensure it is seated properly.

5. Conduct Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1 again.
  2. Insert a 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 the manufacturer's specifications (usually around 150-200 psi).
  5. If low, further diagnosis may be necessary (e.g., valve issues, head gasket).