how to fix P0301 misfire code in Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Gather necessary tools and parts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil covering to access the spark plug.
• Disconnect the ignition coil connector and remove the ignition coil.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear; replace it with a new one if it is fouled or worn.
• Install the new spark plug by hand, then torque it to the manufacturer specification (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

• If the spark plug is fine, test the ignition coil using a multimeter:
  • Measure the primary and secondary resistance as per manufacturer specifications.
• If the ignition coil is defective, replace it with a new one.
• Reassemble all components and ensure all connections are secure.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if cleaning), replacement injector (if necessary)
• Disconnect the fuel line and electrical connector from the fuel injector.
• Remove the fuel injector from the rail.
• Inspect the injector for clogs; clean it using a fuel injector cleaning kit or replace it if necessary.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Compression Test (if misfire persists)

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare to manufacturer specifications; if low, further engine diagnostics may be required.