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.
• Disconnect the negative battery terminal for safety.
• Allow the engine to cool down before starting repairs.

2. Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, extension bar, ratchet.
• Remove the ignition coil for cylinder 4:
  1. Unscrew the bolts holding the coil in place.
  2. Carefully pull the coil out.
• Remove the old spark plug:
  1. Use the spark plug socket to unscrew the spark plug.
  2. Inspect the old spark plug for damage or excessive wear.
• Install a new spark plug:
  1. Apply a small amount of anti-seize compound on the threads of the new spark plug (if applicable).
  2. Hand-tighten the new spark plug into the cylinder head.
  3. Use a torque wrench to tighten the spark plug to the manufacturer’s specification (typically around 25-30 Nm).

3. Replace Ignition Coil

• Tools Required: Torque wrench.
• Install the new ignition coil:
  1. Align the coil with the spark plug and push it down firmly.
  2. Secure it with the bolts previously removed, tightening to the specified torque.

4. Check Fuel Injector

• Tools Required: Fuel injector removal tool (if necessary).
• Inspect the fuel injector for cylinder 4:
  1. Remove the fuel rail if applicable.
  2. Disconnect the injector connector.
  3. Remove the fuel injector and check for clogs or damage.
• Replace the injector if necessary and reinstall in reverse order.

5. Perform a Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 4.
• Insert the compression gauge and crank the engine to obtain a reading.
• Compare the result with the manufacturer's specifications.

6. Inspect for Vacuum Leaks

• Visually inspect and listen for any hissing sounds around the intake manifold and associated hoses.
• Use a smoke machine or carburetor cleaner to identify leaks.