how to fix P0301 misfire code in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the ignition coil from cylinder 1.
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for wear or carbon buildup; replace if necessary.
• Apply a small amount of dielectric grease to the threads of the new spark plug and install it hand-tight.
• Torque the spark plug to the manufacturer’s specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil securely.

3. Test Ignition Coil

• Tools Required: Multimeter.
• Disconnect the electrical connector from the ignition coil.
• Measure the resistance between the terminals of the ignition coil; compare with manufacturer specifications.
• If the resistance is outside the specified range, replace the ignition coil.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the pressure reading; it should meet the manufacturer's specifications (usually around 180-200 psi).
• If the compression is low, further investigation into internal engine components may be required.

5. Inspect Fuel Injector

• Tools Required: Fuel injector cleaner, multimeter.
• Disconnect the fuel injector connector.
• Measure the resistance of the fuel injector; replace if outside specifications.
• Use a fuel injector cleaner to clean the injector or replace it if clogged.