how to fix engine misfire in Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix engine misfire issues (P0300-P0304) in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock and ensure safety during repairs.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket, gap gauge.
• Remove the engine cover if applicable.
• Use the socket wrench to remove old spark plugs.
• Inspect the old plugs for signs of wear or fouling.
• Set the gap on new spark plugs to manufacturer specifications (typically around 0.7-0.8 mm for this model).
• Install new spark plugs and torque them to the manufacturer’s specified value (usually around 25 Nm).

3. Inspect and Replace Ignition Coils

• Tools Required: Socket set, multimeter.
• Disconnect the wiring harness from each ignition coil.
• Remove the ignition coils using the socket wrench.
• Test each coil for resistance with a multimeter; replace any faulty coils.
• Install new ignition coils by reversing the removal process and reconnecting the harness.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaner, socket set.
• If injectors are dirty, use a fuel injector cleaner or consider removing them for ultrasonic cleaning.
• If faulty, replace with new fuel injectors.
• Reinstall the injectors and ensure all connections are secure.

5. Check Compression

• Tools Required: Compression tester.
• Remove spark plugs to allow access to the cylinders.
• Insert the compression tester into each cylinder and crank the engine.
• Record the compression readings; they should be within manufacturer specifications (around 10-12 bar).
• If readings are low, further investigation into valve or piston issues may be required.