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

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Use the spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or carbon buildup; replace if necessary.
• Install the new spark plug by hand to avoid cross-threading, then torque to the manufacturer's specification (typically around 13 lb-ft).
• Reinstall the ignition coil, ensuring it is properly seated and connected.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil using a multimeter.
• If it fails the test, remove the ignition coil and replace it with a new one.
• Reconnect the electrical connector and secure it with bolts.

4. Inspect and Clean Fuel Injector

• Locate the fuel injector for cylinder 1; remove any necessary components for access.
• Disconnect the fuel injector electrical connector.
• Remove the fuel injector from the rail and inspect it for clogs.
• Clean or replace the injector if necessary, ensuring proper sealing upon reinstallation.

5. Perform Compression Test

• Reinstall the spark plug and ignition coil if removed.
• Use a compression tester to check the compression in cylinder 1.
• If compression is below specifications, further diagnosis of the engine may be required (e.g., valve issues, piston rings).