how to fix P0300 misfire code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery negative terminal to ensure safety.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if present (using a socket set).
  2. Disconnect the ignition coils from the spark plugs.
  3. Remove the old spark plugs using a spark plug socket and ratchet.
  4. Inspect the spark plugs for wear; replace if necessary with OEM parts.
  5. Torque new spark plugs to manufacturer specifications (typically around 13 lb-ft).
  6. Reconnect the ignition coils.

3. Check and Replace Ignition Coils

• Sub-steps:
  1. Disconnect the electrical connectors from the ignition coils.
  2. Remove the ignition coils using a socket set.
  3. Inspect the coils for damage; replace any that are faulty with OEM replacements.
  4. Reinstall the coils and reconnect the electrical connectors.

4. Inspect Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position (do not start the engine) to check fuel pressure.
  3. Compare the reading with manufacturer specifications (generally around 40-50 psi).
  4. If pressure is low, check the fuel pump and fuel filter for obstruction or failure.
  5. Replace any faulty components as necessary.

5. Vacuum Leak Inspection

• Sub-steps:
  1. Inspect all vacuum hoses visually for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify any leaks while the engine is running.
  3. Replace any damaged hoses or components.