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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before working on it.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• 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 from cylinder 1:
  1. Use a spark plug socket to unscrew the old spark plug.
  2. Inspect the condition of the spark plug for wear or damage.
• Install a new spark plug:
  1. Apply anti-seize lubricant to the threads of the new spark plug.
  2. Hand-tighten the spark plug into the cylinder head.
  3. Use a torque wrench to tighten the spark plug to the manufacturer’s specified torque (typically around 13 lb-ft).
• Reinstall the ignition coil in reverse order.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was found faulty during inspection, replace it:
  1. Remove the faulty ignition coil as described above.
  2. Install the new ignition coil and secure it with bolts.
  3. Reconnect the electrical connector.

4. Fuel Injector Testing

• If the spark plug and ignition coil are fine, check the fuel injector:
  1. Disconnect the fuel injector connector.
  2. Use a multimeter to check the resistance of the injector; it should match specifications (typically around 12-16 ohms).
  3. Replace the fuel injector if it is out of specification.

5. Final Assembly

• Reconnect the negative battery terminal.
• Start the engine and check for smooth operation.