how to fix P0300 misfire code in my Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, basic hand tools, torque wrench, fuel pressure gauge, and replacement parts as needed.
• Ensure the vehicle is parked on a level surface, and the engine is cool before starting repairs.

2. Replace Spark Plugs

• Sub-steps:
  1. Disconnect the negative battery terminal.
  2. Remove the engine cover if applicable.
  3. Remove the ignition coil pack by unscrewing the retaining bolts and disconnecting the electrical connector.
  4. Use a spark plug socket to remove the old spark plugs.
  5. Inspect the spark plugs; replace any that appear worn or damaged.
  6. Install new spark plugs with the correct torque specification (typically 13-16 lb-ft).
  7. Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coils (if necessary)

• Sub-steps:
  1. If any ignition coils were found faulty during inspection, replace them by following the steps in the Replace Spark Plugs section for removal and installation.
  2. Ensure that the new coils are compatible with the engine specifications.

4. Check and Replace Fuel Filter (if necessary)

• Sub-steps:
  1. Locate the fuel filter in the fuel line (refer to the vehicle's manual for specific location).
  2. Relieve fuel system pressure by removing the fuel pump relay and starting the engine until it stalls.
  3. Disconnect the fuel lines from the filter, taking care to catch any fuel.
  4. Remove the old fuel filter and install the new one, ensuring correct orientation.
  5. Reconnect the fuel lines and reinsert the fuel pump relay.

5. Test Drive and Monitor

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the engine and let it idle for a few minutes.
  3. Take the vehicle for a test drive to ensure the check engine light remains off and performance issues are resolved.