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

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the battery by removing the negative terminal to avoid electrical shock.
• Allow the engine to cool completely before working on it.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil for Cylinder 1:
  1. Disconnect the electrical connector from the ignition coil.
  2. Unscrew the coil using a socket wrench and carefully pull it out.
• Remove the spark plug:
  1. Use a spark plug socket to unscrew the spark plug from Cylinder 1.
  2. Inspect the spark plug for wear or damage (burnt, cracked, or fouled).
• Install new spark plug:
  1. Apply anti-seize compound on the threads of the new spark plug (if recommended).
  2. Torque the spark plug to the manufacturer-recommended specification (typically around 20 Nm).
  3. Reinstall the ignition coil, ensuring it's seated properly, and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or malfunctioning:
  1. Remove the ignition coil as detailed above.
  2. Install the new ignition coil, ensuring proper fit and electrical connection.

4. Check Fuel Injector

• If the spark plug and ignition coil are in good condition:
  1. Disconnect the fuel injector connector for Cylinder 1.
  2. Use a noid light to check for injector pulse.
  3. If no pulse is detected, test the circuit for continuity; if faulty, repair as necessary.
  4. If the injector is malfunctioning, replace it with a compatible unit.

5. Compression Test (if misfire persists)

• If misfire continues after replacing spark plug and ignition coil:
  1. Remove all spark plugs for easier access.
  2. Insert the compression gauge into the Cylinder 1 spark plug hole.
  3. Crank the engine and note the reading. Compare to manufacturer specifications (typically around 150-200 psi).
  4. If compression is low, further investigation is needed for potential internal engine issues.