how to fix P0301 misfire code in my Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil by unscrewing the bolts and gently pulling it off the spark plug.
• Use the spark plug socket to remove the old spark plug.
• Inspect the spark plug for wear and carbon build-up.
• Install a new spark plug, ensuring it is gapped according to manufacturer specifications (typically 0.044 inches for Honda Civic).
• Torque the spark plug to 13 lb-ft (17.6 Nm).

3. Replace Ignition Coil

• Remove any connectors or bolts securing the ignition coil.
• Install the new ignition coil and secure it with bolts.
• Reconnect the electrical connector to the ignition coil.

4. Replace Fuel Injector (if necessary)

• Tools Required: Fuel line disconnect tool, socket set
• Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect the fuel lines from the injector using a fuel line disconnect tool.
• Remove the retaining clips and take out the old fuel injector.
• Install the new fuel injector, ensuring it is seated properly and secured with the retaining clips.

5. Reassemble and Test

• Reconnect any components removed during the process.
• Reconnect the battery terminal.
• Start the engine and check for any misfires or engine warnings.