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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
• Carefully pull out the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace it if necessary with an OEM equivalent, ensuring it is gapped correctly (typically 0.044 inches).
• Reinstall the spark plug and ignition coil, tightening to manufacturer specifications (usually around 13 lb-ft).

3. Test and Replace Ignition Coil

• Remove the ignition coil from cylinder 2.
• Use a multimeter to test the primary and secondary resistance of the coil (refer to the service manual for specific values).
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil, ensuring secure connections.

4. Inspect and Clean Fuel Injector

• Remove the fuel rail to access the injector for cylinder 2.
• Carefully disconnect the electrical connector from the fuel injector.
• Inspect the injector for clogs; if dirty, clean it using an appropriate injector cleaner or replace it with a new part.
• Reinstall the fuel injector and reconnect the fuel rail, ensuring all connections are secure.

5. Perform Compression Test (if necessary)

• Remove the spark plug from cylinder 2 and insert the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer’s specifications. If low, further inspection of piston rings or valves may be necessary.