how to fix Honda Accord Eleventh Generation (2023-present) check engine light code P0301

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease
• Remove the ignition coil from cylinder 1 by disconnecting the electrical connector and unscrewing the retaining bolts.
• Extract the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace it if necessary.
• Apply a small amount of dielectric grease to the spark plug threads and reinstall it, tightening to the manufacturer's specified torque (typically 13-15 lb-ft).
• Reinstall the ignition coil on top of the spark plug.

3. Test and Replace Ignition Coil (if needed)

• Tools Required: Multimeter
• Measure the resistance of the ignition coil using the multimeter. If it’s out of the manufacturer’s specified range, replace the ignition coil with a new one.
• Reconnect the ignition coil electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if applicable)
• Remove the fuel injector from cylinder 1 by disconnecting the fuel line and electrical connector.
• Clean the injector using a fuel injector cleaning kit. If it’s damaged or clogged beyond cleaning, replace the injector.
• Reinstall the fuel injector, ensuring a proper seal.

5. Verify Cylinder Compression

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1 and screw in the compression tester.
• Crank the engine and record the compression reading. It should meet the manufacturer's specifications (typically 180-200 psi).
• If compression is low, further inspection of valves, piston rings, and gaskets is required.