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

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the mounting bolts using a socket set.
  3. Carefully pull out the ignition coil.
• Remove the spark plug:
  1. Use a spark plug socket and ratchet to unscrew the spark plug.
  2. Inspect the spark plug for wear or damage.
• Install a new spark plug:
  1. Apply a small amount of anti-seize compound on the threads of the new spark plug.
  2. Hand-tighten the spark plug, then use a torque wrench to tighten it to the manufacturer's specification (typically around 13 lb-ft).

3. Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage:
  1. Install the new ignition coil in the same position.
  2. Reattach the mounting bolts and tighten them securely.
  3. Reconnect the electrical connector.

4. Check Fuel Injector

• If the spark plug and ignition coil are functioning correctly, check the fuel injector:
  1. Disconnect the fuel injector connector.
  2. Use a multimeter to test for resistance; compare it to manufacturer specifications.
  3. If faulty, replace the fuel injector.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach normal operating temperature.
• Clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive.