my Honda Accord 10th Generation (2018-2022) has a persistent P0301 misfire code, how to fix

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap gauge.
• Remove the ignition coil cover (if applicable) to access the spark plug.
• Use a socket wrench to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear or fouling. Replace if necessary.
• Ensure the new spark plug is gapped correctly according to manufacturer specifications (typically around 0.043 inches).
• Install the spark plug and torque it to the manufacturer's specified value (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Disconnect the ignition coil connector.
• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts.
• Inspect the ignition coil for cracks or signs of failure; replace if needed.
• Install the new ignition coil and torque to the manufacturer’s specifications (usually around 7.5 lb-ft).
• Reconnect the ignition coil connector.

4. Check and Replace Fuel Injector

• Tools Required: Noid light, fuel injector removal tool, torque wrench.
• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check for proper signal to the injector when cranking the engine.
• If the injector is faulty, remove it using the fuel injector removal tool.
• Install a new fuel injector and ensure it is seated properly.
• Torque the fuel injector to the specified value (if applicable).

5. Compression Test (if required)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading; if it is significantly lower than specifications, further investigation is needed for internal engine issues.