how to fix P0301 misfire code on Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather all tools and parts needed for repairs.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1.
  • Tools: Socket set
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary.
  • Parts Required: New spark plug (OEM recommended)
• Install the new spark plug and torque it to the manufacturer’s specifications (usually around 13 lb-ft).
• Reinstall the ignition coil.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, check the ignition coil for faults.
• Remove the ignition coil from cylinder 1.
• Test the ignition coil with a multimeter for resistance.
  • Tools: Multimeter
• If faulty, replace the ignition coil with a new one (OEM recommended).
• Reinstall the ignition coil and ensure it is securely connected.

4. Compression Test

• If the misfire persists, conduct a compression test on cylinder 1.
• 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 the reading to manufacturer specifications (typically around 180-200 psi).
• If compression is low, further investigation into internal engine issues may be required.

5. Inspect Fuel Injector

• If compression is adequate, check the fuel injector for cylinder 1.
• Remove the fuel injector connectors and inspect for damage.
• Use a multimeter to test the injector's resistance.
• If faulty, replace the fuel injector with a new one (OEM recommended).
• Reinstall and ensure all connections are secure.