how to fix P0301 misfire code in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the battery to prevent accidental shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, gap gauge.
• Instructions:
  1. Remove the ignition coil for cylinder 1 by disconnecting the electrical connector and unbolting it.
  2. Remove the spark plug using a spark plug socket.
  3. Inspect the spark plug for wear; if it appears damaged or worn, replace it with a new spark plug (match specifications).
  4. Set the gap of the new spark plug according to the manufacturer's specifications (typically around 0.043 inches).
  5. Install the new spark plug and torque it to the manufacturer’s specifications (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Instructions:
  1. Remove the ignition coil from cylinder 1 (if needed, this may involve removing the spark plug first).
  2. Visually inspect the ignition coil for cracks or signs of overheating.
  3. Replace the ignition coil if any defects are found.
  4. Reinstall the ignition coil and torque it to the manufacturer’s specifications (typically around 8 lb-ft).

4. Test Fuel Injector

• Tools Required: Noid light, multimeter.
• Instructions:
  1. Connect a noid light to the fuel injector connector for cylinder 1.
  2. Crank the engine and observe the noid light for pulsing. If it does not pulse, the injector may be faulty or there may be an electrical issue.
  3. If necessary, replace the fuel injector with an OEM part and reconnect the wiring harness.

5. Compression Test

• Tools Required: Compression tester.
• Instructions:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester and crank the engine.
  3. Note the compression reading; it should meet manufacturer specifications (typically around 180-200 psi).
  4. If the compression is low, further investigation into engine internals may be necessary.