how to fix P0301 misfire code in Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather all required tools and parts.
• Ensure the engine is cool and disconnect the negative battery cable.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for fouling or wear; replace it if necessary.
• Install the new spark plug, torquing it to the manufacturer’s specification (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, check the ignition coil for faults.
• Tools Required: Socket set, multimeter
• Use a multimeter to test the ignition coil's primary and secondary resistance.
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil and connector.

4. Check Fuel Injector

• Tools Required: Fuel injector cleaner, fuel pressure gauge
• If the ignition components are functioning, check the fuel injector for cylinder 1.
• Remove the fuel injector connector and inspect for damage.
• Perform a fuel injector balance test to ensure it is delivering fuel properly.
• Clean or replace the fuel injector if necessary.

5. Test for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• With the engine running, use a smoke machine or spray carburetor cleaner around the intake manifold and throttle body.
• Look for changes in idle speed, which would indicate a vacuum leak.
• Repair any leaks found in the vacuum system.