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

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  1. Disconnect the electrical connector from the ignition coil.
  2. Unscrew the coil using a socket wrench.
  3. Pull the coil straight out.
• Remove the spark plug from cylinder 2:
  1. Use a spark plug socket and ratchet to unscrew the spark plug.
  2. Inspect the spark plug for signs of wear or damage (e.g., fouling, excessive gap).
  3. Install a new spark plug with the correct gap (typically 0.044 inches for Honda Civics).
  4. Torque the spark plug to manufacturer specifications (typically 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Check the ignition coil:
  1. Test the ignition coil using a multimeter to ensure proper resistance.
  2. If faulty, install a new ignition coil for cylinder 2.
• Reinstall the ignition coil:
  1. Position the coil over the spark plug and press down firmly.
  2. Secure it with screws and reconnect the electrical connector.

4. Check Fuel Injector

• Inspect the fuel injector for cylinder 2:
  1. Remove the fuel injector connector.
  2. Perform a resistance test on the injector using a multimeter.
  3. If defective, replace the fuel injector.
• Reinstall the fuel injector (ensure proper O-ring is in place) and reconnect the connector.

5. Reassemble and Test

• Reconnect the battery terminal.
• Start the engine and allow it to idle. Check for smooth operation and absence of the check engine light.