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

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil connector for cylinder 1.
3. Unscrew the ignition coil using a socket set and remove it.
4. Remove the spark plug using a spark plug socket. Inspect for wear or damage.
5. Install the new spark plug, tightening to the manufacturer's specified torque (typically 13-16 lb-ft).
6. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

1. If the spark plug was in good condition, test the ignition coil with a multimeter for primary and secondary resistance.
2. If out of specification, replace the ignition coil with a new one.
3. Reinstall the ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

1. Check the fuel injector for cylinder 1 using a noid light or multimeter to ensure it is receiving the correct signal.
2. If malfunctioning, remove the fuel injector and replace it with a new one.
3. Reinstall the injector and ensure proper connections.

5. Perform Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester and crank the engine to obtain a reading.
3. Compare the reading to the manufacturer's specifications. If low, further investigation of engine internals may be required.

6. Address Vacuum Leaks

1. Inspect all hoses and connections around the intake manifold for signs of wear or damage.
2. Replace any damaged hoses and ensure all connections are secure.