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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil on cylinder 1 by unscrewing it and disconnecting the electrical connector.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the old spark plug for signs of damage (e.g., carbon buildup, wear).
• Install the new spark plug hand-tight, then torque to the manufacturer’s specifications (typically 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, check the ignition coil for signs of damage.
• Tools Required: Multimeter for testing.
• Use a multimeter to test the ignition coil's primary and secondary resistance according to Honda specifications.
• If the coil fails the test, replace it with a new ignition coil.
• Reconnect the ignition coil after installation.

4. Check and Clean Fuel Injector

• If the ignition components are functioning properly, test the fuel injector for cylinder 1.
• Tools Required: Fuel injector cleaner and appropriate connector.
• Disconnect the fuel injector connector and use a fuel injector cleaning kit to clean the injector.
• Reinstall the injector connector and ensure it is secure.

5. Compression Test (if necessary)

• If misfire persists, perform a compression test.
• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1 and connect the compression gauge.
• Crank the engine and record the compression reading.
• Compare with manufacturer specifications; if low, further engine diagnostics may be needed.