how to fix P0302 misfire code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather all required tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 2.
• Unscrew and remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for wear or fouling; replace if necessary.
• Apply dielectric grease to the threads of the new spark plug.
• Install the new spark plug and torque to manufacturer specifications (typically around 13 lb-ft).
• Reinstall the ignition coil.

3. Check and Replace Ignition Coil (if needed)

• Tools Required: Socket set, multimeter (for testing).
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from cylinder 2.
• Test the ignition coil with a multimeter: check for primary and secondary resistance according to specifications.
• If the coil is faulty, install a new ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Access the fuel injector for cylinder 2 by removing any necessary components.
• Disconnect the electrical connector and fuel line from the injector.
• Inspect the injector for clogs; if suspected, clean or replace the injector.
• Reinstall the fuel injector and reconnect the fuel line and electrical connector.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications; if low, further investigation is needed for internal engine issues.