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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery by removing the negative terminal.

2. Replace Spark Plug

1. Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
2. Use a spark plug socket to remove the old spark plug from cylinder 1.
3. Inspect the spark plug for wear; if it is fouled or damaged, replace it with a new one (OEM recommended gap).
4. Install the new spark plug by hand to avoid cross-threading, then torque to the manufacturer's specification (usually around 13 lb-ft).

3. Replace Ignition Coil

1. If the ignition coil tests faulty, install a new ignition coil for cylinder 1.
2. Position the new ignition coil, connect the electrical connector, and secure it with the retaining bolts.
3. Ensure the coil is seated properly before tightening.

4. Check Fuel Injector

1. If the injector is suspected to be faulty, remove the fuel rail to access the injector.
2. Disconnect the fuel injector electrical connector.
3. Replace the faulty injector with a new one, ensuring it is correctly seated in the rail.
4. Reconnect the injector and the fuel rail.

5. Reassemble and Test

1. Reconnect the battery by attaching the negative terminal.
2. Start the engine to ensure that the misfire code has been resolved.
3. Monitor for any abnormal engine behavior or check engine lights.