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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the ignition coil from cylinder 2:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the bolts securing the ignition coil and take it out.
• Remove the spark plug:
  1. Use the spark plug socket to remove the spark plug from cylinder 2.
  2. Inspect the old spark plug for signs of wear or damage.
• Install the new spark plug:
  1. Check the gap on the new spark plug and adjust if necessary.
  2. Install the new spark plug into cylinder 2 and torque to manufacturer specifications (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Fuel Injector

• Tools Required: Fuel injector removal tool, torque wrench.
• Remove the fuel rail if necessary to access the fuel injector:
  1. Relieve fuel system pressure by removing the fuel pump relay and cranking the engine briefly.
  2. Disconnect the fuel lines (be prepared for fuel spillage).
  3. Unbolt the fuel rail and gently lift it to access the injector.
• Remove the fuel injector:
  1. Pull the old injector out of the rail and replace with a new one.
• Reassemble the fuel rail with the new injector and reconnect all lines.

4. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Inspect all vacuum hoses connected to the intake manifold and ensure they are secure and free of damage.
• Use a smoke machine to detect leaks or lightly spray carburetor cleaner around suspected areas while the engine is idling; a change in RPM indicates a leak.