how to resolve P0302 misfire code on Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil for cylinder 2:
  • Use a socket set to remove the bolts securing the coil.
  • Disconnect the electrical connector.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
• Install the new spark plug:
  • Gap the new spark plug according to specifications (typically around 0.043 inches).
  • Hand-tighten the spark plug, then use a torque wrench to tighten it to the manufacturer's specification (usually around 13 lb-ft).
• Reinstall the ignition coil:
  • Reconnect the electrical connector and secure the coil with bolts.

3. Test Ignition Coil (if necessary)

• If the misfire persists, test or replace the ignition coil:
  • Use a multimeter to check the primary and secondary resistance of the ignition coil according to specifications.
  • If faulty, replace the ignition coil.

4. Clean or Replace Fuel Injector (if necessary)

• Remove the fuel injector from cylinder 2:
  • Disconnect the fuel line and electrical connector.
  • Remove the injector using appropriate tools.
• Clean the injector using an ultrasonic cleaner or replace it if cleaning is ineffective.
• Reinstall the fuel injector and securely reconnect the fuel line.

5. Final Assembly

• Reconnect the battery terminal and ensure all components are securely fastened.
• Start the engine and check for any misfire codes.