how to fix P0300 random misfire code on Skoda Octavia NFL (2020-Present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely before starting work.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil covers if applicable.
• Disconnect the ignition coils and remove them using a socket.
• Unscrew and remove the old spark plugs with a spark plug socket.
• Inspect the spark plug gaps and ensure they match manufacturer specifications (typically between 0.6mm - 0.8mm).
• Apply dielectric grease to the new spark plugs and install them, torquing to the manufacturer’s specifications (usually around 20 Nm).
• Reinstall the ignition coils and covers.

3. Check and Replace Ignition Coils

• Tools Required: Socket set, multimeter (if testing coils).
• If the ignition coils were found to be faulty, remove them from the spark plugs.
• Test each ignition coil with a multimeter (check resistance values against specifications).
• Replace any faulty ignition coils with new ones, ensuring they are properly seated.

4. Inspect and Clean Fuel Injectors

• Tools Required: Fuel pressure gauge, injector cleaning kit (if needed).
• Perform a fuel pressure test to ensure adequate fuel delivery.
• If fuel pressure is low, inspect the fuel filter and fuel pump.
• Remove fuel injectors and clean them using a proper injector cleaning kit or replace them if necessary.

5. Inspect Air Intake System

• Tools Required: Screwdriver set, cleaning supplies.
• Check for any air leaks in the intake manifold and vacuum hoses.
• Remove any debris from the air filter and replace it if dirty.
• Clean the throttle body and ensure it operates smoothly.