how to diagnose a misfire with code P0302 in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

• Remove the ignition coil:
  • Unplug the electrical connector.
  • Remove the retaining bolt(s) and lift the coil out.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew and extract the spark plug.
• Install the new spark plug:
  • Apply anti-seize lubricant to the threads (if required).
  • Torque the spark plug to manufacturer specifications (usually around 13 ft-lbs).

3. Replace Ignition Coil (if necessary)

• Install the new ignition coil:
  • Place the new ignition coil into the spark plug hole.
  • Secure it with the retaining bolt(s) and reconnect the electrical connector.

4. Check Fuel Injector (if needed)

• Remove the fuel injector:
  • Disconnect the electrical connector.
  • Remove any retaining clips and unscrew the injector.
• Install the new fuel injector:
  • Lubricate the O-ring on the new injector and place it in the fuel rail.
  • Reconnect the electrical connector and secure it.

5. Reconnect Battery

• Reattach the negative battery terminal securely.

6. Clear Codes and Test

• Use the OBD-II scanner to clear the P0302 code.
• Start the engine and check for any misfire or new codes.