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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge, compression tester
• Gather replacement parts, if necessary (spark plugs, ignition coils, fuel injectors).
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Ignition System Inspection

• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil from cylinder 1 and inspect for cracks or signs of wear.
• Using a multimeter, check the resistance of the ignition coil (compared to manufacturer specifications).
• Remove the spark plug from cylinder 1 and inspect for fouling or wear.
• Replace the spark plug and ignition coil if defective.

3. Fuel Injector Check

• Connect a fuel pressure gauge to the fuel rail and check if the pressure is within specifications while cranking the engine.
• If the pressure is low, check the fuel filter and fuel pump operation.
• If the fuel pressure is adequate, remove the injector from cylinder 1 and inspect it for clogs.
• Clean or replace the fuel injector if necessary.

4. Compression Test

• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and record the compression reading.
• Compare the reading to manufacturer specifications; if low, further diagnostics are required on the engine internals.

5. Reassembly

• Reinstall the fuel injector (if cleaned or replaced) and secure it.
• Reinstall the spark plug and torque it to the manufacturer’s specifications.
• Reinstall the ignition coil onto cylinder 1 and connect the electrical connector.
• Replace the engine cover if removed.