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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  • Remove the spark plug wire or ignition coil from cylinder 2.
  • Use a spark plug socket to remove the spark plug.
  • Inspect the spark plug for wear or fouling; replace if necessary.
  • Ensure the new spark plug is gapped correctly (typically 0.044 inches for Honda).
  • Reinstall the spark plug and reconnect the ignition coil or spark plug wire.

3. Test and Replace Ignition Coil

• Sub-steps:
  • Remove the ignition coil from cylinder 2.
  • Use a multimeter to test the resistance of the ignition coil (check manufacturer specs).
  • If the ignition coil is faulty, replace it with a new one.
  • Reinstall the ignition coil and reconnect the wiring harness.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  • Disconnect the fuel injector connector for cylinder 2.
  • Use a fuel injector cleaning kit to clean the injector.
  • If cleaning does not resolve the issue, replace the fuel injector.
  • Reconnect the fuel injector connector after inspection or replacement.

5. Compression Test (if needed)

• Sub-steps:
  • 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 with manufacturer specifications; if low, further engine diagnostics may be needed.

6. Reassemble and Test Drive

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Start the engine and observe for smooth operation.
  • Take the vehicle for a test drive to ensure the issue is resolved.