how to fix P0302 misfire code in Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather all necessary tools and parts. Disconnect the battery.
• Tools required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaner, and replacement spark plugs and ignition coils if necessary.

2. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 2.
• Remove the spark plug using a socket wrench. Check for signs of wear or fouling.
• Replace the spark plug with a new one that matches OEM specifications and torque to the manufacturer's specifications.

3. Test and Replace Ignition Coil

• Swap the ignition coil from cylinder 2 with another cylinder (e.g., cylinder 1).
• Reconnect the battery and start the engine.
• If the misfire moves to the other cylinder, replace the ignition coil for cylinder 2. If not, proceed to the next step.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 2 using the appropriate socket.
• Inspect the injector for clogs and clean it with fuel injector cleaner.
• If cleaning does not resolve the issue, replace the fuel injector.

5. Perform Compression Test

• If misfire persists, perform a compression test on cylinder 2.
• If low compression is detected, further investigation may be needed for internal engine issues (e.g., valve problems or head gasket failure).