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

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts while working.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate cylinder 2's spark plug (usually found on top of the engine).
  3. Using a spark plug socket, unscrew and remove the spark plug.
  4. Inspect the spark plug for wear, carbon buildup, or damage.
  5. If necessary, replace it with a new spark plug, ensuring it meets OEM specifications (check gap settings).
  6. Reinstall the spark plug and torque it to the manufacturer’s specifications (typically 13-20 lb-ft).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil for cylinder 2.
  2. Remove the mounting bolts securing the ignition coil and take it out.
  3. Inspect the ignition coil for cracks or carbon tracking.
  4. Replace with a new ignition coil if defective.
  5. Reconnect the electrical connector and reinstall the ignition coil.

4. Check and Replace Fuel Injector

• Sub-steps:
  1. Access the fuel rail by removing any necessary components.
  2. Disconnect the fuel injector connector for cylinder 2.
  3. Remove the retaining clips and unscrew the fuel injector.
  4. Inspect for clogs or damage; clean or replace as necessary.
  5. Reinstall the new or cleaned fuel injector and reconnect the electrical connector.

5. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use an OBD-II scanner to clear the trouble codes.
  3. Start the engine and allow it to idle.
  4. Conduct a test drive to ensure the misfire has been resolved and monitor for any reoccurrence of the P0302 code.