how to fix the P0302 code on my Honda Civic 9th Generation (2012-2015)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

1. Remove the ignition coil cover (if applicable) using a socket set.
2. Disconnect the electrical connector from the ignition coil for cylinder 2.
3. Remove the bolt securing the ignition coil and carefully pull it out.
4. Remove the spark plug using a spark plug socket.
5. Inspect the spark plug for wear or damage; replace it if necessary.
6. Install the new spark plug and torque it to the manufacturer's specifications (typically 13 lb-ft).
7. Reinstall the ignition coil, ensuring the connector is secure.

3. Check and Replace Ignition Coil

1. If the spark plug replacement did not resolve the issue, test the ignition coil with a multimeter (check primary and secondary resistance).
2. If faulty, remove the ignition coil as described above.
3. Install the new ignition coil and torque it to specification.
4. Reconnect the ignition coil connector.

4. Inspect and Replace Fuel Injector

1. If misfire persists, disconnect the fuel injector connector for cylinder 2.
2. Use a noid light to check for proper signal to the injector; if no signal, inspect wiring.
3. Remove the fuel rail assembly (follow manufacturer instructions for fuel pressure relief).
4. Replace the fuel injector for cylinder 2 with a new one.
5. Reassemble the fuel rail and reconnect the injector connector.

5. Verify Compression

1. If all components are functioning, perform a compression test on cylinder 2.
2. If compression is low, further investigation into engine internals may be required.