my Honda Accord 10th Generation (2018-2022) has a check engine light with P0301 code

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the mounting bolts using a socket set.
  3. Pull the ignition coil out gently.
• Remove the spark plug:
  1. Use a spark plug socket to remove the spark plug from cylinder 1.
  2. Inspect the spark plug for signs of wear or fouling.
  3. If needed, replace with a new spark plug that meets OEM specifications (e.g., Denso or NGK).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, check the ignition coil:
  1. Test the ignition coil with a multimeter; ensure it has the correct resistance.
  2. If defective, install a new ignition coil specific to the Honda Accord.

4. Inspect and Clean Fuel Injector

• Remove and inspect the fuel injector for cylinder 1:
  1. Disconnect the fuel injector electrical connector.
  2. Remove any retaining clips and use a wrench to unscrew the fuel injector from the rail.
  3. Clean or replace the fuel injector, ensuring the O-rings are properly lubricated before installation.

5. Reassemble and Test

• Reinstall the ignition coil, spark plug, and fuel injector in the reverse order of removal.
• Reconnect the battery.
• Start the engine and monitor for any misfire or check engine light.