how to fix P0301 code on 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 negative terminal of the battery.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from Cylinder 1:
  • Tools Required: Socket set
  • Safety Warning: Handle coils carefully to avoid damage.
• Remove the spark plug from Cylinder 1 using a spark plug socket.
• Inspect the spark plug for wear; replace if damaged or fouled.
• Install a new spark plug to the manufacturer’s specifications (typically 13-15 ft-lbs torque).
• Reinstall the ignition coil.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil is faulty, remove it:
  • Disconnect the electrical connector.
  • Remove the mounting bolts using a socket set.
• Install a new ignition coil in reverse order of removal.
• Ensure proper connection of the electrical connector.

4. Check and Replace Fuel Injector (if necessary)

• If the fuel injector is faulty, access it by removing the intake manifold (if required for your specific engine layout).
• Disconnect the fuel line and electrical connector to the injector.
• Remove the fuel injector from the rail.
• Install a new fuel injector and reconnect the fuel line and electrical connector.

5. Perform a Compression Test (if mechanical issues are suspected)

• Remove the spark plug for Cylinder 1.
• Insert a compression gauge into the spark plug hole.
• Crank the engine to measure compression. Compare results to manufacturer specifications.
• If compression is low, further investigation may be required (valve issues, head gasket failure).