how to diagnose P0302 code in Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0302 cylinder 2 misfire in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery to ensure safety during the repair.

2. Spark Plug Inspection and Replacement

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil from cylinder 2.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for signs of wear, such as fouling, cracks, or excessive gap.
• If necessary, install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.7-0.8 mm).
• Reinstall the ignition coil, ensuring it is seated properly.

3. Ignition Coil Testing and Replacement

• Tools Required: Multimeter
• If the spark plug was okay, test the ignition coil for cylinder 2 with a multimeter to check for proper resistance.
• If the coil is faulty, disconnect the wiring harness and remove the ignition coil.
• Replace it with a new ignition coil and reconnect the wiring harness.

4. Fuel Injector Inspection and Cleaning

• Tools Required: Noid light, fuel injector cleaner
• Disconnect the fuel injector harness for cylinder 2.
• Use a noid light to check for proper signal to the injector; if it does not light up, further inspect wiring and ECM.
• If the injector is functioning, consider using a fuel injector cleaner to clear any potential blockages.
• If necessary, replace the fuel injector with a new one.

5. Compression Test

• Tools Required: Compression gauge
• Remove the spark plug for cylinder 2 and insert the compression gauge.
• Crank the engine to measure the compression; ensure it meets the manufacturer's specifications.
• If compression is low, diagnose for potential issues such as valve problems or head gasket failure.