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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench
• Remove the ignition coils by unscrewing the retaining bolts and disconnecting the electrical connectors.
• Use a spark plug socket to remove the old spark plugs. Inspect the threads and the condition of the plugs.
• Install new spark plugs, ensuring they are gapped correctly per manufacturer specifications (typically around 0.044 inches for Honda).
• Torque the new spark plugs to the manufacturer's recommended specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coils

• Check each ignition coil for damage or signs of wear.
• Replace any faulty ignition coils with OEM parts.
• Reinstall the ignition coils, securing them with bolts and reconnecting the electrical connectors.

4. Test Fuel Injectors

• Use a fuel pressure gauge to check the fuel pressure against specifications (usually 40-50 psi).
• If pressure is low, inspect the fuel filter and replace it if clogged.
• If injectors are faulty, replace them with new units.

5. Check for Vacuum Leaks

• Visually inspect all vacuum lines for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks by spraying around vacuum connections and listening for changes in engine RPM.
• Replace any damaged hoses.

6. Conduct Compression Test

• Remove spark plugs and insert the compression gauge into each cylinder.
• Crank the engine several times and note the compression readings.
• All cylinders should have similar compression (typically 180-210 psi). If any cylinder is significantly lower, further investigation is required.