how to fix P0304 code in Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0304 cylinder 4 misfire in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for repairs.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil from cylinder 4:
  • Disconnect the electrical connector.
  • Unscrew the mounting bolts and gently lift out the coil.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the old spark plug.
• Inspect the spark plug for wear or fouling.
• Install the new spark plug:
  • Use a torque wrench to tighten to the manufacturer's specified torque (usually 20-25 Nm).
• Reinstall the ignition coil:
  • Position it over the spark plug and secure it with bolts.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil shows damage during inspection:
  • Remove it as described above.
  • Install the new ignition coil by reversing the removal steps.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if needed)
• Disconnect the fuel line and electrical connector from the fuel injector.
• Remove the fuel injector from the rail.
• Clean the injector using a fuel injector cleaner or replace it if damaged.
• Reinstall the injector ensuring proper seating.

5. Final Checks

• Reconnect the battery terminal.
• Start the engine and allow it to reach operating temperature.
• Check for any abnormal sounds and monitor the engine's performance.