how do I fix the P0301 misfire code in my Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery negative terminal to prevent electrical shorts.
• Allow the engine to cool before working on it.

2. Replace Spark Plug

• Remove the engine cover if necessary.
• Use a socket and ratchet to remove the spark plug from cylinder 1.
• Inspect the old spark plug and clean the spark plug hole.
• Install a new spark plug, ensuring it is gapped correctly (consult specs for gap size).
• Torque the spark plug to the manufacturer's specification (usually around 13 lb-ft).

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil mounting bolts using a socket.
• Pull the ignition coil straight out of the cylinder head.
• Install the new ignition coil and secure it with bolts.
• Reconnect the electrical connector.

4. Inspect and Clean or Replace Fuel Injector

• Disconnect the fuel injector electrical connector.
• Remove the fuel rail if necessary to access the injector.
• Inspect the fuel injector for clogs or leaks. Clean it with appropriate injector cleaner.
• If clogged beyond cleaning, replace the fuel injector with a new one.
• Reattach the fuel rail and reconnect the injector connector.

5. Test Compression (if necessary)

• If misfire persists, perform a compression test on cylinder 1.
• If compression is low, investigate potential causes such as valve issues or head gasket failure.
• Address any issues found during compression testing.