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

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unscrew the bolts holding the ignition coil in place.
  • Carefully pull the ignition coil out, disconnecting any wiring harness.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
  • Inspect the spark plug for wear or damage.
• Install the new spark plug:
  • Apply anti-seize compound to the threads (if applicable).
  • Hand-tighten the spark plug, then torque it to the manufacturer’s specification (typically 13 lb-ft).
• Reinstall the ignition coil and secure it.

3. Test Ignition Coil

• If the ignition coil was found faulty, replace it:
  • Remove the old ignition coil.
  • Install the new ignition coil and reconnect the wiring harness.
• Ensure that it is seated properly and secured.

4. Clean or Replace Fuel Injector

• If the fuel injector is clogged or malfunctioning:
  • Remove the fuel injector rail.
  • Carefully remove the injector and inspect it for blockages.
  • Clean the injector using a professional cleaning kit or replace it with a new one if necessary.
• Reinstall the fuel rail and reconnect all hoses.

5. Check for Vacuum Leaks

• Inspect all hoses and gaskets around the intake manifold.
• Replace any damaged hoses or gaskets.
• Recheck the tightness of all connections.