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 necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, anti-seize compound.
• Remove the ignition coil from cylinder 4:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the bolts holding the ignition coil in place.
  3. Gently pull the ignition coil out.
• Remove the spark plug:
  1. Use a spark plug socket to remove the old spark plug.
  2. Inspect the spark plug for wear or fouling.
  3. Apply anti-seize compound to the threads of the new spark plug.
  4. Install the new spark plug and torque it to the manufacturer’s specifications (typically around 15-20 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test Fuel Injector

• Tools Required: Fuel injector cleaner, multimeter (if testing resistance).
• If the spark plug is fine, test the fuel injector:
  1. Disconnect the fuel injector connector for cylinder 4.
  2. Use a multimeter to check the resistance of the injector (should be within manufacturer specs).
  3. If the resistance is out of spec, replace the injector.
  4. Clean the injector using a fuel injector cleaner or replace it if necessary.

4. Check Compression (if needed)

• Tools Required: Compression tester.
• If misfire persists after replacing the spark plug and checking the injector:
  1. Remove the spark plug from cylinder 4.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare to manufacturer specifications; if low, further engine diagnosis may be required.