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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, vacuum gauge.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Ignition Components

• Inspect Spark Plug:

  • Remove the engine cover if necessary.
  • Use a socket to remove the spark plug from cylinder 2.
  • Inspect the spark plug for wear, carbon buildup, or damage.
  • Replace with a new spark plug of the manufacturer’s specification if needed (e.g., NGK or Denso).

• Inspect Ignition Coil:

  • Disconnect the ignition coil connector.
  • Remove the coil from cylinder 2 using a socket.
  • Check for signs of damage or wear; replace if necessary.

3. Inspect and Clean Fuel Injector

• Remove Fuel Injector:

  • Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  • Disconnect the fuel injector connector on cylinder 2.
  • Remove the fuel rail (if necessary) to access the injector.
  • Carefully remove the injector from the rail.

• Clean or Replace Injector:

  • Use a specialized injector cleaner kit to clean the injector.
  • If cleaning does not resolve issues, replace with a new fuel injector compatible with the vehicle.

4. Perform Compression Test

• Check Engine Compression:
  • Remove the spark plug from cylinder 2.
  • Insert the compression tester into the spark plug hole.
  • Crank the engine and read the compression value. Compare with manufacturer specifications.
  • If compression is low, further investigation into internal engine components is needed.

5. Verify and Reassemble

• Reinstall all components (injector, ignition coil, spark plug, fuel rail).
• Reconnect the negative battery terminal.
• Clear the P0302 code using the OBD-II scanner.