how to fix the check engine light and P0301 code on my Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable):
  • Unscrew any bolts holding the cover.
  • Gently lift and remove the cover.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil:
  • Unscrew the mounting bolts (usually 10mm).
  • Carefully pull out the ignition coil.
• Remove the old spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
  • Inspect the old spark plug for wear or damage.
• Install the new spark plug:
  • Apply anti-seize compound on the threads (if required).
  • Hand-tighten the spark plug, then torque to the manufacturer’s specification (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaner or replacement injector, safety glasses, gloves.
• If using a cleaner:
  • Disconnect the fuel injector connector.
  • Remove the fuel rail (if necessary) to access the injector.
  • Use a fuel injector cleaner and follow the product instructions.
• If replacing:
  • Remove the fuel rail from the engine.
  • Pull out the old injector and install the new one.
  • Reinstall the fuel rail and reconnect all lines and connectors.

4. Reassemble and Check

• Reinstall the engine cover if removed.
• Reconnect the battery.
• Start the engine and check for smooth operation.