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

Solution

1. Preparation

• Gather tools and parts, including an OBD-II scanner, socket set, ratchet, torque wrench, spark plug socket, and a compression tester.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Inspect and Replace Ignition Components

1. Remove Ignition Coils

   • Unplug the electrical connectors from each ignition coil.
   • Remove the bolts securing the coils using a socket and ratchet.
   • Carefully lift out the ignition coils.

2. Inspect and Replace Spark Plugs

   • Use a spark plug socket to remove the spark plugs.
   • Inspect the spark plugs for wear or damage; replace if necessary.
   • Ensure the gap on new spark plugs is set to manufacturer specifications (typically around 0.044 inches).
   • Install new spark plugs and torque to the manufacturer’s specifications (usually around 13 lb-ft).

3. Reinstall Ignition Coils

   • Place the ignition coils back into their respective positions.
   • Secure with bolts and reconnect the electrical connectors.

3. Check and Replace Fuel System Components

1. Test Fuel Pressure

   • Connect a fuel pressure gauge to the fuel rail.
   • Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
   • If the pressure is below specifications, proceed to replace the fuel filter or fuel pump as necessary.

2. Inspect Fuel Injectors

   • Ensure fuel injectors are clean and functioning properly.
   • If necessary, remove and clean injectors using an ultrasonic cleaner or replace with new injectors.

4. Verify Air Intake System

1. Inspect Air Filter and Intake Hoses

   • Remove the air filter and inspect for dirt or clogging; replace if dirty.
   • Check intake hoses for cracks or leaks and replace if necessary.

2. Throttle Body Cleaning

   • Remove the throttle body and clean it using throttle body cleaner.
   • Reinstall and ensure all connections are secure.