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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery negative terminal to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, extension bar, ratchet
• Remove the ignition coil from cylinder 2:
  • Unscrew the mounting bolts and carefully pull out the ignition coil.
• Remove the spark plug:
  • Use the spark plug socket and ratchet to unscrew the spark plug from cylinder 2.
• Inspect the spark plug:
  • Check for signs of wear, oil fouling, or carbon buildup.
• Replace the spark plug if damaged:
  • Install a new spark plug to the manufacturer's specified torque (usually around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Same as above
• If the spark plug is in good condition, check the ignition coil:
  • Test the resistance of the ignition coil using a multimeter; if it’s out of spec, replace it.
• Install the new ignition coil:
  • Secure it with the mounting bolts and reconnect the wiring harness.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit
• Remove the fuel injector for cylinder 2:
  • Disconnect the fuel line and electrical connector, then unbolt the injector from the rail.
• Clean or replace the fuel injector:
  • If cleaning, follow the instructions on the fuel injector cleaner kit.
  • If replacement is needed, install a new injector, ensuring proper seating and sealing.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Inspect the intake manifold and vacuum lines for leaks:
  • Use a smoke machine or spray carburetor cleaner around the intake manifold and listen for RPM changes.
• Repair any leaks found by replacing gaskets or hoses as necessary.