how to fix P0302 misfire code in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2:

  • Unplug the electrical connector.
  • Remove the bolts securing the coil.
  • Carefully pull the coil out of the spark plug well.

• Remove the spark plug:

  • Use a spark plug socket and ratchet to unscrew the spark plug.
  • Inspect the spark plug for wear, fouling, or damage.

• Install the new spark plug:

  • Apply a small amount of anti-seize compound on the threads.
  • Torque the spark plug to 13 lb-ft (17.6 Nm).
  • Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

• If the spark plug was not the issue, check the ignition coil:
  • Swap the ignition coil from cylinder 2 with another cylinder.
  • Clear the codes and run the engine to see if the misfire moves to the other cylinder.

4. Inspect Fuel Injector

• If misfire persists, check the fuel injector:
  • Disconnect the fuel injector connector.
  • Use a multimeter to test for resistance; it should be within specifications (usually around 12-16 ohms).
  • If faulty, replace the fuel injector.

5. Compression Test

• If all components are functioning properly, perform a compression test:
  • Remove the spark plug from cylinder 2.
  • Insert the compression gauge and crank the engine.
  • Compare the reading to the manufacturer’s specifications (usually around 180-200 psi for most engines).
  • If low, inspect for valve issues or piston damage.