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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

• Remove the engine cover if applicable using a socket set.
• Use a spark plug socket to remove the spark plug from cylinder one.
• Inspect the old spark plug; if damaged or worn, replace it with a new one (OEM recommended).
• Torque the new spark plug to the manufacturer’s specification (typically around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Remove the ignition coil from cylinder one by unbolting it and disconnecting the electrical connector.
• Inspect the coil for cracks or signs of damage. If faulty, replace it with a new ignition coil.
• Reinstall the ignition coil and reconnect the electrical connector securely.

4. Check and Clean Fuel Injector

• Disconnect the fuel injector connector for cylinder one.
• Remove the fuel injector using a fuel injector puller or appropriate tool.
• Inspect the injector for clogs; if dirty, clean it with an appropriate injector cleaning solution.
• If the injector is faulty, replace it with a new one and reinstall it.

5. Compression Test (if necessary)

• Remove the spark plug from cylinder one again.
• Insert a compression tester into the spark plug hole.
• Crank the engine and read the compression level; it should be within the manufacturer's specifications (usually around 180 psi).
• If compression is low, further engine diagnostics may be necessary.

6. Reassemble and Test

• Reinstall all removed components, ensuring all connections are secure.
• Reconnect the battery terminal.