how to fix the P0301 code on my Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector.
  • Unbolt the coil and pull it out.
• Remove the spark plug using a spark plug socket:
  • Inspect the old spark plug for wear, carbon buildup, or oil fouling.
• Install a new spark plug (OEM recommended):
  • Torque the new spark plug to the manufacturer's specification (typically around 13 lb-ft).
• Reinstall the ignition coil, ensuring the electrical connector is secured.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil:
  • Use a multimeter to check the primary and secondary resistance of the ignition coil.
• Replace the ignition coil if it is faulty.
• Ensure proper seating and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel rail to access the fuel injector for cylinder 1:
  • Relieve fuel pressure from the fuel system.
  • Disconnect the fuel lines and electrical connectors from the injector.
• Inspect the injector for clogs or damage. Clean or replace if necessary.
• Reinstall the injector and ensure all connections are secure.

5. Compression Test (if necessary)

• If misfire persists, perform a compression test:
  • Remove the spark plug and insert a compression gauge into cylinder 1.
  • Crank the engine and record the compression reading.
• A reading below specification indicates internal engine issues that may require further diagnosis.