how to fix P0302 misfire code on Volkswagen Golf MK5 (2004-2008)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Disconnect the electrical connector from the ignition coil.
  • Unbolt the ignition coil using a socket set.
• Remove the spark plug:
  • Use a spark plug socket to unscrew and remove the spark plug.
• Install a new spark plug:
  • Check the gap of the new spark plug (set to manufacturer's specifications).
  • Install the new spark plug, tightening it to manufacturer-recommended torque (typically around 22 ft-lbs).
• Reinstall the ignition coil.

3. Test Ignition Coil (if necessary)

• If the misfire persists, test the ignition coil:
  • Swap the ignition coil from cylinder 2 with another cylinder (e.g., cylinder 1).
  • Clear the codes and run the engine to see if the misfire moves to the swapped cylinder.
• If the misfire follows the ignition coil, replace it.

4. Inspect Fuel Injector (if necessary)

• If the issue remains, inspect the fuel injector for cylinder 2:
  • Disconnect the fuel injector connector.
  • Remove the fuel rail to access the injector.
  • Check for clogs or leaks in the injector.
• Replace with a new fuel injector if found faulty.