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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shock.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Tools Needed: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Use the spark plug socket to remove the old spark plug.
• Inspect the spark plug gap and replace with a new spark plug, ensuring it is gapped properly according to manufacturer specifications (typically 0.044 inches for Honda).
• Torque the spark plug to the manufacturer’s specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil is damaged or not functioning, replace it.
• Remove the ignition coil connector and unscrew the ignition coil from cylinder 1.
• Install the new ignition coil and reconnect the connector.
• Reinstall the engine cover.

4. Check Fuel Injector

• If the spark plug and ignition coil are functioning correctly, test the fuel injector for cylinder 1.
• Disconnect the fuel injector connector and perform a resistance test using a multimeter.
• If the resistance is out of specification, replace the fuel injector.
• Reconnect the fuel injector connector after replacement.

5. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code.
• Start the engine and check for any remaining codes.
• Conduct a test drive to ensure proper operation and that the check engine light does not reappear.