how to fix P0301 misfire code in Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down if it has been running.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, anti-seize compound.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the old spark plug using the spark plug socket.
• Inspect the spark plug hole for debris and clean if necessary.
• Install the new spark plug by hand to avoid cross-threading, then use the torque wrench to tighten it to the manufacturer’s specified torque (typically 13 lb-ft).
• Apply a small amount of anti-seize compound to the threads of the new spark plug if recommended.

3. Replace Ignition Coil

• Tools Required: Socket set.
• Remove the ignition coil from cylinder 1 after spark plug replacement.
• Install the new ignition coil and reconnect the electrical connector.
• Ensure all connections are secure.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, cleaning kit (if applicable).
• If the injector is suspected to be clogged, remove it from the cylinder head.
• Clean the injector using a fuel injector cleaning kit or have it professionally cleaned.
• Reinstall the injector and ensure proper sealing.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Inspect the intake manifold and vacuum hoses visually for cracks or disconnections.
• Use a smoke machine to detect leaks or spray carburetor cleaner around suspected areas while the engine is running; listen for changes in idle.