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

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector cleaner, replacement spark plug, ignition coil (if needed).
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 using the socket set.
• Unplug the electrical connector from the ignition coil.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for damage; replace it if necessary.
• Install the new spark plug, ensuring it is torqued to the manufacturer’s specifications (typically around 13 lb-ft).
• Reinstall the ignition coil, reconnect the electrical connector, and ensure it is securely fastened.

3. Test and Replace Ignition Coil (if necessary)

• If the spark plug inspection indicates no issues, test the ignition coil using a multimeter to check for proper resistance.
• If the coil is faulty, replace it with a new one, ensuring it is compatible with your vehicle model.
• Reinstall the coil and reconnect the wiring.

4. Check Fuel Injector

• If misfire persists, remove the fuel injector for cylinder 2.
• Clean the injector using a fuel injector cleaner or replace it if it is clogged or malfunctioning.
• Reinstall the injector ensuring proper seating and connection.

5. Conduct Compression Test

• If issues remain, perform a compression test on cylinder 2.
• If compression is low, further diagnosis is needed for potential internal engine issues such as valve or head gasket problems.