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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover (if applicable) using a socket set.
• Carefully remove the spark plugs using a spark plug socket. Inspect for wear or fouling.
• If worn, replace with OEM or equivalent spark plugs, ensuring the gap is set to manufacturer specifications (often around 0.044 inches).
• Reinstall the spark plugs and torque to the specified value (typically around 13 lb-ft).

3. Check and Replace Ignition Coils

• Disconnect the electrical connector from each ignition coil.
• Use a multimeter to measure the resistance of each coil (should be within manufacturer specifications).
• Replace any faulty ignition coils with OEM parts.
• Reconnect the electrical connectors and secure the coils back in place.

4. Inspect and Clean Fuel Injectors

• Remove the fuel rail assembly to access the fuel injectors, ensuring to relieve fuel pressure first.
• Inspect each injector for clogs or leaks. If necessary, use a fuel injector cleaner or replace with new injectors.
• Reinstall the fuel rail assembly and torque to the specified value (usually around 15 lb-ft).

5. Check for Air Leaks

• Inspect all vacuum hoses and the intake manifold for cracks or looseness.
• Use a smoke machine to identify any leaks in the air intake system.
• Repair or replace any damaged hoses or gaskets to ensure proper sealing.