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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil on cylinder 1 by unfastening the retaining bolts and disconnecting the electrical connector.
• Use a spark plug socket to remove the old spark plug from cylinder 1.
• Inspect the spark plug gap and replace it with a new spark plug, ensuring it is gapped to the manufacturer’s specifications (typically around 0.044 inches).
• Torque the new spark plug to the specified value (usually around 13 lb-ft or 18 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

• Tools Required: Multimeter.
• Disconnect the ignition coil and perform a resistance test according to the specifications in the service manual.
• If out of specs, replace the ignition coil with a new one.

4. Inspect/Replace Fuel Injector

• Tools Required: Fuel injector removal tool, socket set.
• Remove the fuel rail to access the fuel injector for cylinder 1.
• Inspect the injector for clogs. If necessary, clean or replace the fuel injector.
• Reinstall the injector and fuel rail, ensuring proper seating and connection.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and install the compression tester.
• Crank the engine and record the compression reading. Compare it with specifications (above 180 psi is typical).
• If compression is low, further diagnosis is needed for valve or piston issues.