how to fix Honda Civic 10th Generation (2016-2021) engine misfire code P0302

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shocks.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts.
• Detach the electrical connector from the ignition coil.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear or damage, such as fouling or excessive gap.
• If necessary, replace it with a new spark plug that meets manufacturer specifications (e.g., NGK or Denso).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil for continuity and resistance using a multimeter.
• If faulty, replace the ignition coil with a new one, ensuring it is compatible with the vehicle.
• Reinstall the ignition coil and reconnect the electrical connector securely.

4. Check Fuel Injector

• If ignition components are fine, test the fuel injector for cylinder 2.
• Disconnect the fuel injector connector and measure the resistance with a multimeter; it should be within manufacturer specifications.
• If the injector is faulty, replace it with a new fuel injector.
• Reconnect the fuel injector and ensure it is seated properly.

5. Perform Final Checks

• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner.
• Start the engine and check for smooth operation and absence of misfire codes.