how to fix a P0302 misfire code on Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent any electrical shorts.
• Allow the engine to cool down.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the spark plug wire or ignition coil from cylinder 2.
• Use a spark plug socket to remove the spark plug from cylinder 2.
• Inspect the spark plug for signs of wear or fouling. Replace if necessary.
• Install the new spark plug and torque it to the manufacturer's specification (typically 13-16 lb-ft).
• Reconnect the ignition coil or spark plug wire.

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter
• Remove the ignition coil from cylinder 2 by unbolting it and disconnecting the electrical connector.
• Test the ignition coil using a multimeter to check for proper resistance. Replace if faulty.
• Install the new ignition coil and reattach the electrical connector and bolts.

4. Inspect and Clean Fuel Injector

• Tools Required: Ratchet set, fuel injector cleaning kit (if needed)
• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel rail and inspect the injector for clogs.
• Clean the injector using a fuel injector cleaner or replace it if necessary.
• Reassemble the fuel rail and reconnect all hoses and connectors.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine (or equivalent method)
• Use a smoke machine to detect any vacuum leaks around the intake manifold and hoses.
• Repair or replace any faulty hoses or gaskets found during the inspection.

6. Compression Test (if required)

• Tools Required: Compression gauge
• Remove the spark plug from cylinder 2 and insert the compression gauge.
• Crank the engine to take a reading. Compare to the manufacturer’s specifications.
• If compression is low, further investigation is required for internal engine issues.