how to fix P0302 misfire code on 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 down before starting work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unscrew the bolts securing the coil.
  • Gently pull the coil out from the spark plug.
• Remove the spark plug using a spark plug socket:
  • Inspect for wear, carbon buildup, or damage.
  • If necessary, replace with a new spark plug (specification: NGK or Denso with correct gap).
• Reinstall the ignition coil and secure it with bolts.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or if the spark plug replacement does not resolve the issue:
  • Disconnect the electrical connector from the ignition coil.
  • Remove the ignition coil from the mount.
  • Install the new ignition coil and reconnect the electrical connector.

4. Inspect and Replace Fuel Injector (if necessary)

• Remove the fuel rail to access the injector for cylinder 2:
  • Release fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
  • Disconnect the fuel line and any electrical connectors from the fuel injector.
• Remove the fuel injector using a suitable puller tool:
  • Inspect for clogs or leakage.
  • Replace with a new fuel injector if defective.
• Reinstall the fuel rail and reconnect all components.