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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before working on the ignition system.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unscrew the mounting bolts with a socket set.
  • Gently lift and disconnect the electrical connector.
• Remove the spark plug using a spark plug socket:
  • Ensure the spark plug socket is properly aligned.
  • Unscrew the spark plug and inspect for wear or damage.
• Install the new spark plug:
  • Apply anti-seize compound on the threads (if recommended).
  • Torque the spark plug to the manufacturer’s specification (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage or failure:
  • Remove the coil from cylinder 1 as described previously.
  • Install the new ignition coil and torque it to the manufacturer’s specification.

4. Inspect and Clean Fuel Injector

• If the fuel injector is suspected to be faulty:
  • Remove the fuel injector from cylinder 1 using appropriate tools.
  • Clean the injector with a suitable cleaner or replace it if it is clogged or damaged.
• Reinstall the fuel injector ensuring proper seating.

5. Final Assembly

• Reconnect all components and ensure all bolts are tightened to specification.
• Reconnect the negative battery terminal.