how to fix P0303 code in Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0303 cylinder 3 misfire in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil cover if applicable.
• Disconnect the wire harness from the ignition coil on cylinder 3.
• Unscrew and remove the ignition coil.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for fouling or damage; replace if necessary.
• Install the new spark plug and torque to manufacturer specifications (typically 15-20 Nm).
• Reinstall the ignition coil and reconnect the wire harness.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil with a multimeter for proper resistance.
• If faulty, replace the ignition coil with a new one.
• Ensure the installation is secure and reconnect any wiring harnesses.

4. Inspect and Test Fuel Injector

• Remove the fuel injector connector for cylinder 3.
• Inspect for corrosion or damage.
• If necessary, test the fuel injector with a multimeter for proper operation.
• Replace the injector if it does not meet specifications.
• Reinstall the connector securely.

5. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 3.
• Insert the compression tester into the spark plug hole.
• Crank the engine and take the reading; compare it to manufacturer specifications.
• If compression is low, further engine diagnostics may be necessary.

6. Check for Vacuum Leaks

• Inspect all vacuum hoses and the intake manifold for leaks.
• Use a smoke machine or carburetor cleaner to identify leaks.
• Repair or replace any damaged hoses or gaskets.