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

Solution

1. Preparation

• Gather tools and parts for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector for cylinder 2.
  3. Remove the ignition coil using a socket set.
  4. Unscrew and remove the old spark plug with a spark plug socket.
  5. Inspect the spark plug for fouling or damage.
  6. Install a new spark plug to the manufacturer's torque specification (typically around 13 lb-ft).
  7. Reinstall the ignition coil, ensuring the connector is secure.

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the spark plug is fine, replace the ignition coil for cylinder 2.
  2. Remove the old coil by unscrewing it from the engine.
  3. Install the new ignition coil and ensure it is properly seated and connected.

4. Test Fuel Injector (if necessary)

• Sub-steps:
  1. If the issue persists, remove the fuel injector for cylinder 2.
  2. Clean the injector with a fuel injector cleaner or replace it if it’s malfunctioning.
  3. Reinstall the injector, ensuring proper sealing and connection.

5. Final Checks

• Reconnect the battery terminal.
• Start the engine and allow it to reach operating temperature.
• Monitor for any check engine light reappearance.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Spark plug socket
• Noid light (for injector testing)
• Compression tester (if needed)

Parts Required:

• Spark plug for cylinder 2
• Ignition coil for cylinder 2 (if needed)
• Fuel injector for cylinder 2 (if needed)

Estimated Repair Time: 1-3 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before opening any components.