how to fix P0301 code in Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear, carbon buildup, or damage.
• Replace with a new spark plug that meets OEM specifications (typically NGK or Denso).
• Reinstall the spark plug and torque it to the manufacturer’s specifications (usually around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Test the ignition coil with a multimeter for proper resistance.
• If faulty, replace the ignition coil with a new one, ensuring it matches OEM specifications.
• Reconnect the electrical connector and secure the coil.

4. Fuel Injector Inspection

• If the issue persists, check the fuel injector for cylinder 1.
• Remove the fuel rail, taking care to relieve fuel pressure beforehand.
• Inspect the injector for clogs or electrical faults with a multimeter.
• Clean or replace the fuel injector as necessary.

5. Vacuum Leak Check

• Inspect hoses and gaskets around the intake manifold and throttle body for leaks.
• Use a smoke machine or carburetor cleaner to check for leaks.
• Replace any damaged hoses or gaskets found during inspection.