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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil covering from the top of the engine.
• Use the spark plug socket to remove each spark plug.
• Inspect the spark plugs for wear and replace them if necessary.
• Ensure the new spark plugs are gapped to the manufacturer's specifications.
• Install the spark plugs and torque them to the specified value (usually around 13-15 lb-ft).

3. Inspect and Replace Ignition Coils

• Tools Required: Socket set, multimeter (for testing).
• Disconnect the ignition coil connectors.
• Remove the ignition coils from the engine.
• Test each ignition coil with a multimeter for resistance; replace any that are out of specifications.
• Install the new or verified ignition coils and reconnect the connectors.

4. Fuel Injector Inspection and Cleaning

• Tools Required: Fuel injector cleaning kit (if cleaning), socket set.
• Remove the fuel rail according to the service manual; ensure to relieve fuel pressure first.
• Inspect the fuel injectors for clogs or leaks.
• If cleaning, follow the injector cleaning kit instructions; otherwise, replace faulty injectors.
• Reinstall the fuel rail ensuring proper sealing.

5. Vacuum Hose Inspection

• Tools Required: Visual inspection.
• Inspect all vacuum hoses for signs of wear, cracks, or disconnections.
• Replace any damaged hoses with OEM specifications.

6. Fuel Pressure Test

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "ON" position without starting the engine and check if fuel pressure is within the manufacturer’s specs.
• If pressure is low, inspect the fuel pump and fuel filter.