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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Replace Spark Plug in Cylinder 1

• Tools Required: Socket set (10mm and 5/8"), torque wrench.
• Remove the engine cover if applicable (remove bolts with a socket).
• Locate the ignition coil for cylinder 1 (usually at the front of the engine).
• Disconnect the electrical connector from the ignition coil.
• Remove the bolt securing the ignition coil with a socket.
• Carefully pull the ignition coil out from the cylinder head.
• Remove the spark plug using a spark plug socket and ratchet.
• Install the new spark plug, hand-tighten, then torque to 13 lb-ft (18 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil appears damaged, replace it with a new one.
• Install the new ignition coil in reverse order of removal, ensuring it is securely fastened.

4. Check Fuel Injector (if necessary)

• Tools Required: Multimeter.
• Disconnect the fuel injector connector.
• Use a multimeter to check for proper resistance (typically around 12-16 ohms).
• If the injector is faulty, replace it with a new one.
• Reconnect the fuel injector connector and ensure it is seated properly.

5. Perform a Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading with factory specifications (typically 180-200 psi).
• If the compression is below specifications, further engine diagnostics may be required.