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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge
• Remove the ignition coil cover (if applicable).
• Disconnect the ignition coil connector.
• Remove the ignition coil using a socket wrench.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary. Ensure the new spark plug is gapped correctly (typically 0.044 inches for Honda Civic).
• Reinstall the spark plug and torque to manufacturer's specifications (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set
• After removing the spark plug, inspect the ignition coil for any cracks or damage.
• If defective, replace the ignition coil with a new one.
• Reinstall the ignition coil and connect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector
• If the injector is clogged, remove it from the fuel rail.
• Clean the injector using a fuel injector cleaning kit or replace it if necessary.
• Reinstall the injector ensuring all connections are secure.

5. Perform Compression Test

• Tools Required: Compression gauge
• Remove the spark plug and insert the compression gauge into cylinder 1.
• Crank the engine and record the compression reading. Compare it to specifications (usually around 180 psi).
• If compression is low, further investigation into the valve seats or piston rings is necessary.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the error codes.