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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil cover (if applicable) using a socket set.
  2. Disconnect the electrical connector from the ignition coil.
  3. Remove the ignition coil using a socket wrench.
  4. Unscrew the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear; replace it if it shows signs of fouling or damage.
  6. Gap the new spark plug to the manufacturer’s specifications (typically around 0.044 inches for Honda).
  7. Install the new spark plug and torque it to 13 lb-ft (or manufacturer's spec).
  8. Reinstall the ignition coil and connect the electrical connector.

3. Test and Replace Ignition Coil (if needed)

• Sub-steps:
  1. Use a multimeter to test the resistance of the ignition coil. Compare with specifications (typically 0.5-0.7 ohms for primary side and several k-ohms for secondary).
  2. If the coil is faulty, remove it and replace it with a new one.
  3. Reinstall the ignition coil and reconnect the connector.

4. Inspect and Replace Fuel Injector (if needed)

• Sub-steps:
  1. Use a noid light to check the fuel injector pulse. If no pulse, check wiring and connectors.
  2. If the injector is faulty, disconnect it and remove it from the fuel rail.
  3. Install the new fuel injector and reconnect the fuel line and electrical connector.