how to fix misfiring issue on Honda Accord Eleventh Generation (2023-present) with P0301 code

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unscrewing the fastening bolts.
• Carefully lift out the ignition coil and disconnect the electrical connector.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug gap and ensure it matches specifications (typically around 0.044 inches for Honda).
• Install the new spark plug, hand-tighten it, and then torque it to 13 lb-ft.

3. Check/Replace Ignition Coil

• If the ignition coil shows signs of failure, replace it with a new one.
• Reconnect the electrical connector to the ignition coil.
• Reinstall the coil onto the spark plug and secure it with bolts, ensuring proper torque.

4. Inspect/Replace Fuel Injector

• If the fuel injector is clogged, remove it using a fuel injector removal tool.
• Clean the injector with a specialized cleaner or replace it if necessary.
• Reinstall the fuel injector, ensuring it is seated properly in the intake manifold.

5. Compression Test (if necessary)

• If compression issues are suspected, remove the spark plug and attach a compression gauge to cylinder 1.
• Crank the engine and record the compression reading. It should be within the manufacturer's specifications (typically around 180 psi).
• If the reading is low, further investigation into valves and piston rings may be required.