how to resolve a P0301 code in my Volkswagen Golf MK6 (2009-2014)?

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Use a socket set to remove the bolts securing the coil.
  • Gently pull the coil out while avoiding damage to the connector.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
  • Inspect the spark plug for wear or fouling.
• Replace with a new spark plug that meets OEM specifications (e.g., NGK or Bosch).
• Reinstall the spark plug and tighten to the manufacturer's torque specifications (typically around 20-25 Nm).

3. Inspect and Replace Ignition Coil

• If the ignition coil appears damaged or faulty, replace it:
  • Connect the new ignition coil to the electrical connector.
  • Secure it in place with the bolts removed earlier.
• Reconnect the negative battery terminal.

4. Test Fuel Injector

• If the misfire persists, inspect the fuel injector:
  • Disconnect the electrical connector from the fuel injector.
  • Use a multimeter to check for proper resistance (consult service manual for specifications).
  • If faulty, replace the fuel injector with a new one.

5. Compression Test (if necessary)

• If all previous steps do not resolve the issue:
  • Remove the ignition coil and spark plug from cylinder 1.
  • Insert a compression gauge into the spark plug hole.
  • Crank the engine and record the compression reading (it should be within manufacturer specs).
  • If low, further investigation of the engine internals may be required.